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diff --git a/external/include/stb_textedit.h b/external/include/stb_textedit.h
deleted file mode 100644
index 4b731a0..0000000
--- a/external/include/stb_textedit.h
+++ /dev/null
@@ -1,1322 +0,0 @@
-// [ImGui] this is a slightly modified version of stb_truetype.h 1.9. Those changes would need to be pushed into nothings/sb
-// [ImGui] - fixed linestart handler when over last character of multi-line buffer + simplified existing code (#588, #815)
-// [ImGui] - fixed a state corruption/crash bug in stb_text_redo and stb_textedit_discard_redo (#715)
-// [ImGui] - fixed a crash bug in stb_textedit_discard_redo (#681)
-// [ImGui] - fixed some minor warnings
-
-// stb_textedit.h - v1.9  - public domain - Sean Barrett
-// Development of this library was sponsored by RAD Game Tools
-//
-// This C header file implements the guts of a multi-line text-editing
-// widget; you implement display, word-wrapping, and low-level string
-// insertion/deletion, and stb_textedit will map user inputs into
-// insertions & deletions, plus updates to the cursor position,
-// selection state, and undo state.
-//
-// It is intended for use in games and other systems that need to build
-// their own custom widgets and which do not have heavy text-editing
-// requirements (this library is not recommended for use for editing large
-// texts, as its performance does not scale and it has limited undo).
-//
-// Non-trivial behaviors are modelled after Windows text controls.
-// 
-//
-// LICENSE
-//
-//   This software is dual-licensed to the public domain and under the following
-//   license: you are granted a perpetual, irrevocable license to copy, modify,
-//   publish, and distribute this file as you see fit.
-//
-//
-// DEPENDENCIES
-//
-// Uses the C runtime function 'memmove', which you can override
-// by defining STB_TEXTEDIT_memmove before the implementation.
-// Uses no other functions. Performs no runtime allocations.
-//
-//
-// VERSION HISTORY
-//
-//   1.9  (2016-08-27) customizable move-by-word
-//   1.8  (2016-04-02) better keyboard handling when mouse button is down
-//   1.7  (2015-09-13) change y range handling in case baseline is non-0
-//   1.6  (2015-04-15) allow STB_TEXTEDIT_memmove
-//   1.5  (2014-09-10) add support for secondary keys for OS X
-//   1.4  (2014-08-17) fix signed/unsigned warnings
-//   1.3  (2014-06-19) fix mouse clicking to round to nearest char boundary
-//   1.2  (2014-05-27) fix some RAD types that had crept into the new code
-//   1.1  (2013-12-15) move-by-word (requires STB_TEXTEDIT_IS_SPACE )
-//   1.0  (2012-07-26) improve documentation, initial public release
-//   0.3  (2012-02-24) bugfixes, single-line mode; insert mode
-//   0.2  (2011-11-28) fixes to undo/redo
-//   0.1  (2010-07-08) initial version
-//
-// ADDITIONAL CONTRIBUTORS
-//
-//   Ulf Winklemann: move-by-word in 1.1
-//   Fabian Giesen: secondary key inputs in 1.5
-//   Martins Mozeiko: STB_TEXTEDIT_memmove
-//
-//   Bugfixes:
-//      Scott Graham
-//      Daniel Keller
-//      Omar Cornut
-//
-// USAGE
-//
-// This file behaves differently depending on what symbols you define
-// before including it.
-//
-//
-// Header-file mode:
-//
-//   If you do not define STB_TEXTEDIT_IMPLEMENTATION before including this,
-//   it will operate in "header file" mode. In this mode, it declares a
-//   single public symbol, STB_TexteditState, which encapsulates the current
-//   state of a text widget (except for the string, which you will store
-//   separately).
-//
-//   To compile in this mode, you must define STB_TEXTEDIT_CHARTYPE to a
-//   primitive type that defines a single character (e.g. char, wchar_t, etc).
-//
-//   To save space or increase undo-ability, you can optionally define the
-//   following things that are used by the undo system:
-//
-//      STB_TEXTEDIT_POSITIONTYPE         small int type encoding a valid cursor position
-//      STB_TEXTEDIT_UNDOSTATECOUNT       the number of undo states to allow
-//      STB_TEXTEDIT_UNDOCHARCOUNT        the number of characters to store in the undo buffer
-//
-//   If you don't define these, they are set to permissive types and
-//   moderate sizes. The undo system does no memory allocations, so
-//   it grows STB_TexteditState by the worst-case storage which is (in bytes):
-//
-//        [4 + sizeof(STB_TEXTEDIT_POSITIONTYPE)] * STB_TEXTEDIT_UNDOSTATE_COUNT
-//      +      sizeof(STB_TEXTEDIT_CHARTYPE)      * STB_TEXTEDIT_UNDOCHAR_COUNT
-//
-//
-// Implementation mode:
-//
-//   If you define STB_TEXTEDIT_IMPLEMENTATION before including this, it
-//   will compile the implementation of the text edit widget, depending
-//   on a large number of symbols which must be defined before the include.
-//
-//   The implementation is defined only as static functions. You will then
-//   need to provide your own APIs in the same file which will access the
-//   static functions.
-//
-//   The basic concept is that you provide a "string" object which
-//   behaves like an array of characters. stb_textedit uses indices to
-//   refer to positions in the string, implicitly representing positions
-//   in the displayed textedit. This is true for both plain text and
-//   rich text; even with rich text stb_truetype interacts with your
-//   code as if there was an array of all the displayed characters.
-//
-// Symbols that must be the same in header-file and implementation mode:
-//
-//     STB_TEXTEDIT_CHARTYPE             the character type
-//     STB_TEXTEDIT_POSITIONTYPE         small type that a valid cursor position
-//     STB_TEXTEDIT_UNDOSTATECOUNT       the number of undo states to allow
-//     STB_TEXTEDIT_UNDOCHARCOUNT        the number of characters to store in the undo buffer
-//
-// Symbols you must define for implementation mode:
-//
-//    STB_TEXTEDIT_STRING               the type of object representing a string being edited,
-//                                      typically this is a wrapper object with other data you need
-//
-//    STB_TEXTEDIT_STRINGLEN(obj)       the length of the string (ideally O(1))
-//    STB_TEXTEDIT_LAYOUTROW(&r,obj,n)  returns the results of laying out a line of characters
-//                                        starting from character #n (see discussion below)
-//    STB_TEXTEDIT_GETWIDTH(obj,n,i)    returns the pixel delta from the xpos of the i'th character
-//                                        to the xpos of the i+1'th char for a line of characters
-//                                        starting at character #n (i.e. accounts for kerning
-//                                        with previous char)
-//    STB_TEXTEDIT_KEYTOTEXT(k)         maps a keyboard input to an insertable character
-//                                        (return type is int, -1 means not valid to insert)
-//    STB_TEXTEDIT_GETCHAR(obj,i)       returns the i'th character of obj, 0-based
-//    STB_TEXTEDIT_NEWLINE              the character returned by _GETCHAR() we recognize
-//                                        as manually wordwrapping for end-of-line positioning
-//
-//    STB_TEXTEDIT_DELETECHARS(obj,i,n)      delete n characters starting at i
-//    STB_TEXTEDIT_INSERTCHARS(obj,i,c*,n)   insert n characters at i (pointed to by STB_TEXTEDIT_CHARTYPE*)
-//
-//    STB_TEXTEDIT_K_SHIFT       a power of two that is or'd in to a keyboard input to represent the shift key
-//
-//    STB_TEXTEDIT_K_LEFT        keyboard input to move cursor left
-//    STB_TEXTEDIT_K_RIGHT       keyboard input to move cursor right
-//    STB_TEXTEDIT_K_UP          keyboard input to move cursor up
-//    STB_TEXTEDIT_K_DOWN        keyboard input to move cursor down
-//    STB_TEXTEDIT_K_LINESTART   keyboard input to move cursor to start of line  // e.g. HOME
-//    STB_TEXTEDIT_K_LINEEND     keyboard input to move cursor to end of line    // e.g. END
-//    STB_TEXTEDIT_K_TEXTSTART   keyboard input to move cursor to start of text  // e.g. ctrl-HOME
-//    STB_TEXTEDIT_K_TEXTEND     keyboard input to move cursor to end of text    // e.g. ctrl-END
-//    STB_TEXTEDIT_K_DELETE      keyboard input to delete selection or character under cursor
-//    STB_TEXTEDIT_K_BACKSPACE   keyboard input to delete selection or character left of cursor
-//    STB_TEXTEDIT_K_UNDO        keyboard input to perform undo
-//    STB_TEXTEDIT_K_REDO        keyboard input to perform redo
-//
-// Optional:
-//    STB_TEXTEDIT_K_INSERT              keyboard input to toggle insert mode
-//    STB_TEXTEDIT_IS_SPACE(ch)          true if character is whitespace (e.g. 'isspace'),
-//                                          required for default WORDLEFT/WORDRIGHT handlers
-//    STB_TEXTEDIT_MOVEWORDLEFT(obj,i)   custom handler for WORDLEFT, returns index to move cursor to
-//    STB_TEXTEDIT_MOVEWORDRIGHT(obj,i)  custom handler for WORDRIGHT, returns index to move cursor to
-//    STB_TEXTEDIT_K_WORDLEFT            keyboard input to move cursor left one word // e.g. ctrl-LEFT
-//    STB_TEXTEDIT_K_WORDRIGHT           keyboard input to move cursor right one word // e.g. ctrl-RIGHT
-//    STB_TEXTEDIT_K_LINESTART2          secondary keyboard input to move cursor to start of line
-//    STB_TEXTEDIT_K_LINEEND2            secondary keyboard input to move cursor to end of line
-//    STB_TEXTEDIT_K_TEXTSTART2          secondary keyboard input to move cursor to start of text
-//    STB_TEXTEDIT_K_TEXTEND2            secondary keyboard input to move cursor to end of text
-//
-// Todo:
-//    STB_TEXTEDIT_K_PGUP        keyboard input to move cursor up a page
-//    STB_TEXTEDIT_K_PGDOWN      keyboard input to move cursor down a page
-//
-// Keyboard input must be encoded as a single integer value; e.g. a character code
-// and some bitflags that represent shift states. to simplify the interface, SHIFT must
-// be a bitflag, so we can test the shifted state of cursor movements to allow selection,
-// i.e. (STB_TEXTED_K_RIGHT|STB_TEXTEDIT_K_SHIFT) should be shifted right-arrow.
-//
-// You can encode other things, such as CONTROL or ALT, in additional bits, and
-// then test for their presence in e.g. STB_TEXTEDIT_K_WORDLEFT. For example,
-// my Windows implementations add an additional CONTROL bit, and an additional KEYDOWN
-// bit. Then all of the STB_TEXTEDIT_K_ values bitwise-or in the KEYDOWN bit,
-// and I pass both WM_KEYDOWN and WM_CHAR events to the "key" function in the
-// API below. The control keys will only match WM_KEYDOWN events because of the
-// keydown bit I add, and STB_TEXTEDIT_KEYTOTEXT only tests for the KEYDOWN
-// bit so it only decodes WM_CHAR events.
-//
-// STB_TEXTEDIT_LAYOUTROW returns information about the shape of one displayed
-// row of characters assuming they start on the i'th character--the width and
-// the height and the number of characters consumed. This allows this library
-// to traverse the entire layout incrementally. You need to compute word-wrapping
-// here.
-//
-// Each textfield keeps its own insert mode state, which is not how normal
-// applications work. To keep an app-wide insert mode, update/copy the
-// "insert_mode" field of STB_TexteditState before/after calling API functions.
-//
-// API
-//
-//    void stb_textedit_initialize_state(STB_TexteditState *state, int is_single_line)
-//
-//    void stb_textedit_click(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y)
-//    void stb_textedit_drag(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y)
-//    int  stb_textedit_cut(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
-//    int  stb_textedit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE *text, int len)
-//    void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int key)
-//
-//    Each of these functions potentially updates the string and updates the
-//    state.
-//
-//      initialize_state:
-//          set the textedit state to a known good default state when initially
-//          constructing the textedit.
-//
-//      click:
-//          call this with the mouse x,y on a mouse down; it will update the cursor
-//          and reset the selection start/end to the cursor point. the x,y must
-//          be relative to the text widget, with (0,0) being the top left.
-//     
-//      drag:
-//          call this with the mouse x,y on a mouse drag/up; it will update the
-//          cursor and the selection end point
-//     
-//      cut:
-//          call this to delete the current selection; returns true if there was
-//          one. you should FIRST copy the current selection to the system paste buffer.
-//          (To copy, just copy the current selection out of the string yourself.)
-//     
-//      paste:
-//          call this to paste text at the current cursor point or over the current
-//          selection if there is one.
-//     
-//      key:
-//          call this for keyboard inputs sent to the textfield. you can use it
-//          for "key down" events or for "translated" key events. if you need to
-//          do both (as in Win32), or distinguish Unicode characters from control
-//          inputs, set a high bit to distinguish the two; then you can define the
-//          various definitions like STB_TEXTEDIT_K_LEFT have the is-key-event bit
-//          set, and make STB_TEXTEDIT_KEYTOCHAR check that the is-key-event bit is
-//          clear.
-//     
-//   When rendering, you can read the cursor position and selection state from
-//   the STB_TexteditState.
-//
-//
-// Notes:
-//
-// This is designed to be usable in IMGUI, so it allows for the possibility of
-// running in an IMGUI that has NOT cached the multi-line layout. For this
-// reason, it provides an interface that is compatible with computing the
-// layout incrementally--we try to make sure we make as few passes through
-// as possible. (For example, to locate the mouse pointer in the text, we
-// could define functions that return the X and Y positions of characters
-// and binary search Y and then X, but if we're doing dynamic layout this
-// will run the layout algorithm many times, so instead we manually search
-// forward in one pass. Similar logic applies to e.g. up-arrow and
-// down-arrow movement.)
-//
-// If it's run in a widget that *has* cached the layout, then this is less
-// efficient, but it's not horrible on modern computers. But you wouldn't
-// want to edit million-line files with it.
-
-
-////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////
-////
-////   Header-file mode
-////
-////
-
-#ifndef INCLUDE_STB_TEXTEDIT_H
-#define INCLUDE_STB_TEXTEDIT_H
-
-////////////////////////////////////////////////////////////////////////
-//
-//     STB_TexteditState
-//
-// Definition of STB_TexteditState which you should store
-// per-textfield; it includes cursor position, selection state,
-// and undo state.
-//
-
-#ifndef STB_TEXTEDIT_UNDOSTATECOUNT
-#define STB_TEXTEDIT_UNDOSTATECOUNT   99
-#endif
-#ifndef STB_TEXTEDIT_UNDOCHARCOUNT
-#define STB_TEXTEDIT_UNDOCHARCOUNT   999
-#endif
-#ifndef STB_TEXTEDIT_CHARTYPE
-#define STB_TEXTEDIT_CHARTYPE        int
-#endif
-#ifndef STB_TEXTEDIT_POSITIONTYPE
-#define STB_TEXTEDIT_POSITIONTYPE    int
-#endif
-
-typedef struct
-{
-   // private data
-   STB_TEXTEDIT_POSITIONTYPE  where;
-   short           insert_length;
-   short           delete_length;
-   short           char_storage;
-} StbUndoRecord;
-
-typedef struct
-{
-   // private data
-   StbUndoRecord          undo_rec [STB_TEXTEDIT_UNDOSTATECOUNT];
-   STB_TEXTEDIT_CHARTYPE  undo_char[STB_TEXTEDIT_UNDOCHARCOUNT];
-   short undo_point, redo_point;
-   short undo_char_point, redo_char_point;
-} StbUndoState;
-
-typedef struct
-{
-   /////////////////////
-   //
-   // public data
-   //
-
-   int cursor;
-   // position of the text cursor within the string
-
-   int select_start;          // selection start point
-   int select_end;
-   // selection start and end point in characters; if equal, no selection.
-   // note that start may be less than or greater than end (e.g. when
-   // dragging the mouse, start is where the initial click was, and you
-   // can drag in either direction)
-
-   unsigned char insert_mode;
-   // each textfield keeps its own insert mode state. to keep an app-wide
-   // insert mode, copy this value in/out of the app state
-
-   /////////////////////
-   //
-   // private data
-   //
-   unsigned char cursor_at_end_of_line; // not implemented yet
-   unsigned char initialized;
-   unsigned char has_preferred_x;
-   unsigned char single_line;
-   unsigned char padding1, padding2, padding3;
-   float preferred_x; // this determines where the cursor up/down tries to seek to along x
-   StbUndoState undostate;
-} STB_TexteditState;
-
-
-////////////////////////////////////////////////////////////////////////
-//
-//     StbTexteditRow
-//
-// Result of layout query, used by stb_textedit to determine where
-// the text in each row is.
-
-// result of layout query
-typedef struct
-{
-   float x0,x1;             // starting x location, end x location (allows for align=right, etc)
-   float baseline_y_delta;  // position of baseline relative to previous row's baseline
-   float ymin,ymax;         // height of row above and below baseline
-   int num_chars;
-} StbTexteditRow;
-#endif //INCLUDE_STB_TEXTEDIT_H
-
-
-////////////////////////////////////////////////////////////////////////////
-////////////////////////////////////////////////////////////////////////////
-////
-////   Implementation mode
-////
-////
-
-
-// implementation isn't include-guarded, since it might have indirectly
-// included just the "header" portion
-#ifdef STB_TEXTEDIT_IMPLEMENTATION
-
-#ifndef STB_TEXTEDIT_memmove
-#include <string.h>
-#define STB_TEXTEDIT_memmove memmove
-#endif
-
-
-/////////////////////////////////////////////////////////////////////////////
-//
-//      Mouse input handling
-//
-
-// traverse the layout to locate the nearest character to a display position
-static int stb_text_locate_coord(STB_TEXTEDIT_STRING *str, float x, float y)
-{
-   StbTexteditRow r;
-   int n = STB_TEXTEDIT_STRINGLEN(str);
-   float base_y = 0, prev_x;
-   int i=0, k;
-
-   r.x0 = r.x1 = 0;
-   r.ymin = r.ymax = 0;
-   r.num_chars = 0;
-
-   // search rows to find one that straddles 'y'
-   while (i < n) {
-      STB_TEXTEDIT_LAYOUTROW(&r, str, i);
-      if (r.num_chars <= 0)
-         return n;
-
-      if (i==0 && y < base_y + r.ymin)
-         return 0;
-
-      if (y < base_y + r.ymax)
-         break;
-
-      i += r.num_chars;
-      base_y += r.baseline_y_delta;
-   }
-
-   // below all text, return 'after' last character
-   if (i >= n)
-      return n;
-
-   // check if it's before the beginning of the line
-   if (x < r.x0)
-      return i;
-
-   // check if it's before the end of the line
-   if (x < r.x1) {
-      // search characters in row for one that straddles 'x'
-      prev_x = r.x0;
-      for (k=0; k < r.num_chars; ++k) {
-         float w = STB_TEXTEDIT_GETWIDTH(str, i, k);
-         if (x < prev_x+w) {
-            if (x < prev_x+w/2)
-               return k+i;
-            else
-               return k+i+1;
-         }
-         prev_x += w;
-      }
-      // shouldn't happen, but if it does, fall through to end-of-line case
-   }
-
-   // if the last character is a newline, return that. otherwise return 'after' the last character
-   if (STB_TEXTEDIT_GETCHAR(str, i+r.num_chars-1) == STB_TEXTEDIT_NEWLINE)
-      return i+r.num_chars-1;
-   else
-      return i+r.num_chars;
-}
-
-// API click: on mouse down, move the cursor to the clicked location, and reset the selection
-static void stb_textedit_click(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y)
-{
-   state->cursor = stb_text_locate_coord(str, x, y);
-   state->select_start = state->cursor;
-   state->select_end = state->cursor;
-   state->has_preferred_x = 0;
-}
-
-// API drag: on mouse drag, move the cursor and selection endpoint to the clicked location
-static void stb_textedit_drag(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y)
-{
-   int p = stb_text_locate_coord(str, x, y);
-   if (state->select_start == state->select_end)
-      state->select_start = state->cursor;
-   state->cursor = state->select_end = p;
-}
-
-/////////////////////////////////////////////////////////////////////////////
-//
-//      Keyboard input handling
-//
-
-// forward declarations
-static void stb_text_undo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state);
-static void stb_text_redo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state);
-static void stb_text_makeundo_delete(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int length);
-static void stb_text_makeundo_insert(STB_TexteditState *state, int where, int length);
-static void stb_text_makeundo_replace(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int old_length, int new_length);
-
-typedef struct
-{
-   float x,y;    // position of n'th character
-   float height; // height of line
-   int first_char, length; // first char of row, and length
-   int prev_first;  // first char of previous row
-} StbFindState;
-
-// find the x/y location of a character, and remember info about the previous row in
-// case we get a move-up event (for page up, we'll have to rescan)
-static void stb_textedit_find_charpos(StbFindState *find, STB_TEXTEDIT_STRING *str, int n, int single_line)
-{
-   StbTexteditRow r;
-   int prev_start = 0;
-   int z = STB_TEXTEDIT_STRINGLEN(str);
-   int i=0, first;
-
-   if (n == z) {
-      // if it's at the end, then find the last line -- simpler than trying to
-      // explicitly handle this case in the regular code
-      if (single_line) {
-         STB_TEXTEDIT_LAYOUTROW(&r, str, 0);
-         find->y = 0;
-         find->first_char = 0;
-         find->length = z;
-         find->height = r.ymax - r.ymin;
-         find->x = r.x1;
-      } else {
-         find->y = 0;
-         find->x = 0;
-         find->height = 1;
-         while (i < z) {
-            STB_TEXTEDIT_LAYOUTROW(&r, str, i);
-            prev_start = i;
-            i += r.num_chars;
-         }
-         find->first_char = i;
-         find->length = 0;
-         find->prev_first = prev_start;
-      }
-      return;
-   }
-
-   // search rows to find the one that straddles character n
-   find->y = 0;
-
-   for(;;) {
-      STB_TEXTEDIT_LAYOUTROW(&r, str, i);
-      if (n < i + r.num_chars)
-         break;
-      prev_start = i;
-      i += r.num_chars;
-      find->y += r.baseline_y_delta;
-   }
-
-   find->first_char = first = i;
-   find->length = r.num_chars;
-   find->height = r.ymax - r.ymin;
-   find->prev_first = prev_start;
-
-   // now scan to find xpos
-   find->x = r.x0;
-   i = 0;
-   for (i=0; first+i < n; ++i)
-      find->x += STB_TEXTEDIT_GETWIDTH(str, first, i);
-}
-
-#define STB_TEXT_HAS_SELECTION(s)   ((s)->select_start != (s)->select_end)
-
-// make the selection/cursor state valid if client altered the string
-static void stb_textedit_clamp(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
-{
-   int n = STB_TEXTEDIT_STRINGLEN(str);
-   if (STB_TEXT_HAS_SELECTION(state)) {
-      if (state->select_start > n) state->select_start = n;
-      if (state->select_end   > n) state->select_end = n;
-      // if clamping forced them to be equal, move the cursor to match
-      if (state->select_start == state->select_end)
-         state->cursor = state->select_start;
-   }
-   if (state->cursor > n) state->cursor = n;
-}
-
-// delete characters while updating undo
-static void stb_textedit_delete(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int len)
-{
-   stb_text_makeundo_delete(str, state, where, len);
-   STB_TEXTEDIT_DELETECHARS(str, where, len);
-   state->has_preferred_x = 0;
-}
-
-// delete the section
-static void stb_textedit_delete_selection(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
-{
-   stb_textedit_clamp(str, state);
-   if (STB_TEXT_HAS_SELECTION(state)) {
-      if (state->select_start < state->select_end) {
-         stb_textedit_delete(str, state, state->select_start, state->select_end - state->select_start);
-         state->select_end = state->cursor = state->select_start;
-      } else {
-         stb_textedit_delete(str, state, state->select_end, state->select_start - state->select_end);
-         state->select_start = state->cursor = state->select_end;
-      }
-      state->has_preferred_x = 0;
-   }
-}
-
-// canoncialize the selection so start <= end
-static void stb_textedit_sortselection(STB_TexteditState *state)
-{
-   if (state->select_end < state->select_start) {
-      int temp = state->select_end;
-      state->select_end = state->select_start;
-      state->select_start = temp;
-   }
-}
-
-// move cursor to first character of selection
-static void stb_textedit_move_to_first(STB_TexteditState *state)
-{
-   if (STB_TEXT_HAS_SELECTION(state)) {
-      stb_textedit_sortselection(state);
-      state->cursor = state->select_start;
-      state->select_end = state->select_start;
-      state->has_preferred_x = 0;
-   }
-}
-
-// move cursor to last character of selection
-static void stb_textedit_move_to_last(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
-{
-   if (STB_TEXT_HAS_SELECTION(state)) {
-      stb_textedit_sortselection(state);
-      stb_textedit_clamp(str, state);
-      state->cursor = state->select_end;
-      state->select_start = state->select_end;
-      state->has_preferred_x = 0;
-   }
-}
-
-#ifdef STB_TEXTEDIT_IS_SPACE
-static int is_word_boundary( STB_TEXTEDIT_STRING *str, int idx )
-{
-   return idx > 0 ? (STB_TEXTEDIT_IS_SPACE( STB_TEXTEDIT_GETCHAR(str,idx-1) ) && !STB_TEXTEDIT_IS_SPACE( STB_TEXTEDIT_GETCHAR(str, idx) ) ) : 1;
-}
-
-#ifndef STB_TEXTEDIT_MOVEWORDLEFT
-static int stb_textedit_move_to_word_previous( STB_TEXTEDIT_STRING *str, int c )
-{
-   --c; // always move at least one character
-   while( c >= 0 && !is_word_boundary( str, c ) )
-      --c;
-
-   if( c < 0 )
-      c = 0;
-
-   return c;
-}
-#define STB_TEXTEDIT_MOVEWORDLEFT stb_textedit_move_to_word_previous
-#endif
-
-#ifndef STB_TEXTEDIT_MOVEWORDRIGHT
-static int stb_textedit_move_to_word_next( STB_TEXTEDIT_STRING *str, int c )
-{
-   const int len = STB_TEXTEDIT_STRINGLEN(str);
-   ++c; // always move at least one character
-   while( c < len && !is_word_boundary( str, c ) )
-      ++c;
-
-   if( c > len )
-      c = len;
-
-   return c;
-}
-#define STB_TEXTEDIT_MOVEWORDRIGHT stb_textedit_move_to_word_next
-#endif
-
-#endif
-
-// update selection and cursor to match each other
-static void stb_textedit_prep_selection_at_cursor(STB_TexteditState *state)
-{
-   if (!STB_TEXT_HAS_SELECTION(state))
-      state->select_start = state->select_end = state->cursor;
-   else
-      state->cursor = state->select_end;
-}
-
-// API cut: delete selection
-static int stb_textedit_cut(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
-{
-   if (STB_TEXT_HAS_SELECTION(state)) {
-      stb_textedit_delete_selection(str,state); // implicity clamps
-      state->has_preferred_x = 0;
-      return 1;
-   }
-   return 0;
-}
-
-// API paste: replace existing selection with passed-in text
-static int stb_textedit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE const *ctext, int len)
-{
-   STB_TEXTEDIT_CHARTYPE *text = (STB_TEXTEDIT_CHARTYPE *) ctext;
-   // if there's a selection, the paste should delete it
-   stb_textedit_clamp(str, state);
-   stb_textedit_delete_selection(str,state);
-   // try to insert the characters
-   if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, text, len)) {
-      stb_text_makeundo_insert(state, state->cursor, len);
-      state->cursor += len;
-      state->has_preferred_x = 0;
-      return 1;
-   }
-   // remove the undo since we didn't actually insert the characters
-   if (state->undostate.undo_point)
-      --state->undostate.undo_point;
-   return 0;
-}
-
-// API key: process a keyboard input
-static void stb_textedit_key(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int key)
-{
-retry:
-   switch (key) {
-      default: {
-         int c = STB_TEXTEDIT_KEYTOTEXT(key);
-         if (c > 0) {
-            STB_TEXTEDIT_CHARTYPE ch = (STB_TEXTEDIT_CHARTYPE) c;
-
-            // can't add newline in single-line mode
-            if (c == '\n' && state->single_line)
-               break;
-
-            if (state->insert_mode && !STB_TEXT_HAS_SELECTION(state) && state->cursor < STB_TEXTEDIT_STRINGLEN(str)) {
-               stb_text_makeundo_replace(str, state, state->cursor, 1, 1);
-               STB_TEXTEDIT_DELETECHARS(str, state->cursor, 1);
-               if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) {
-                  ++state->cursor;
-                  state->has_preferred_x = 0;
-               }
-            } else {
-               stb_textedit_delete_selection(str,state); // implicity clamps
-               if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, &ch, 1)) {
-                  stb_text_makeundo_insert(state, state->cursor, 1);
-                  ++state->cursor;
-                  state->has_preferred_x = 0;
-               }
-            }
-         }
-         break;
-      }
-
-#ifdef STB_TEXTEDIT_K_INSERT
-      case STB_TEXTEDIT_K_INSERT:
-         state->insert_mode = !state->insert_mode;
-         break;
-#endif
-         
-      case STB_TEXTEDIT_K_UNDO:
-         stb_text_undo(str, state);
-         state->has_preferred_x = 0;
-         break;
-
-      case STB_TEXTEDIT_K_REDO:
-         stb_text_redo(str, state);
-         state->has_preferred_x = 0;
-         break;
-
-      case STB_TEXTEDIT_K_LEFT:
-         // if currently there's a selection, move cursor to start of selection
-         if (STB_TEXT_HAS_SELECTION(state))
-            stb_textedit_move_to_first(state);
-         else 
-            if (state->cursor > 0)
-               --state->cursor;
-         state->has_preferred_x = 0;
-         break;
-
-      case STB_TEXTEDIT_K_RIGHT:
-         // if currently there's a selection, move cursor to end of selection
-         if (STB_TEXT_HAS_SELECTION(state))
-            stb_textedit_move_to_last(str, state);
-         else
-            ++state->cursor;
-         stb_textedit_clamp(str, state);
-         state->has_preferred_x = 0;
-         break;
-
-      case STB_TEXTEDIT_K_LEFT | STB_TEXTEDIT_K_SHIFT:
-         stb_textedit_clamp(str, state);
-         stb_textedit_prep_selection_at_cursor(state);
-         // move selection left
-         if (state->select_end > 0)
-            --state->select_end;
-         state->cursor = state->select_end;
-         state->has_preferred_x = 0;
-         break;
-
-#ifdef STB_TEXTEDIT_MOVEWORDLEFT
-      case STB_TEXTEDIT_K_WORDLEFT:
-         if (STB_TEXT_HAS_SELECTION(state))
-            stb_textedit_move_to_first(state);
-         else {
-            state->cursor = STB_TEXTEDIT_MOVEWORDLEFT(str, state->cursor);
-            stb_textedit_clamp( str, state );
-         }
-         break;
-
-      case STB_TEXTEDIT_K_WORDLEFT | STB_TEXTEDIT_K_SHIFT:
-         if( !STB_TEXT_HAS_SELECTION( state ) )
-            stb_textedit_prep_selection_at_cursor(state);
-
-         state->cursor = STB_TEXTEDIT_MOVEWORDLEFT(str, state->cursor);
-         state->select_end = state->cursor;
-
-         stb_textedit_clamp( str, state );
-         break;
-#endif
-
-#ifdef STB_TEXTEDIT_MOVEWORDRIGHT
-      case STB_TEXTEDIT_K_WORDRIGHT:
-         if (STB_TEXT_HAS_SELECTION(state)) 
-            stb_textedit_move_to_last(str, state);
-         else {
-            state->cursor = STB_TEXTEDIT_MOVEWORDRIGHT(str, state->cursor);
-            stb_textedit_clamp( str, state );
-         }
-         break;
-
-      case STB_TEXTEDIT_K_WORDRIGHT | STB_TEXTEDIT_K_SHIFT:
-         if( !STB_TEXT_HAS_SELECTION( state ) )
-            stb_textedit_prep_selection_at_cursor(state);
-
-         state->cursor = STB_TEXTEDIT_MOVEWORDRIGHT(str, state->cursor);
-         state->select_end = state->cursor;
-
-         stb_textedit_clamp( str, state );
-         break;
-#endif
-
-      case STB_TEXTEDIT_K_RIGHT | STB_TEXTEDIT_K_SHIFT:
-         stb_textedit_prep_selection_at_cursor(state);
-         // move selection right
-         ++state->select_end;
-         stb_textedit_clamp(str, state);
-         state->cursor = state->select_end;
-         state->has_preferred_x = 0;
-         break;
-
-      case STB_TEXTEDIT_K_DOWN:
-      case STB_TEXTEDIT_K_DOWN | STB_TEXTEDIT_K_SHIFT: {
-         StbFindState find;
-         StbTexteditRow row;
-         int i, sel = (key & STB_TEXTEDIT_K_SHIFT) != 0;
-
-         if (state->single_line) {
-            // on windows, up&down in single-line behave like left&right
-            key = STB_TEXTEDIT_K_RIGHT | (key & STB_TEXTEDIT_K_SHIFT);
-            goto retry;
-         }
-
-         if (sel)
-            stb_textedit_prep_selection_at_cursor(state);
-         else if (STB_TEXT_HAS_SELECTION(state))
-            stb_textedit_move_to_last(str,state);
-
-         // compute current position of cursor point
-         stb_textedit_clamp(str, state);
-         stb_textedit_find_charpos(&find, str, state->cursor, state->single_line);
-
-         // now find character position down a row
-         if (find.length) {
-            float goal_x = state->has_preferred_x ? state->preferred_x : find.x;
-            float x;
-            int start = find.first_char + find.length;
-            state->cursor = start;
-            STB_TEXTEDIT_LAYOUTROW(&row, str, state->cursor);
-            x = row.x0;
-            for (i=0; i < row.num_chars; ++i) {
-               float dx = STB_TEXTEDIT_GETWIDTH(str, start, i);
-               #ifdef STB_TEXTEDIT_GETWIDTH_NEWLINE
-               if (dx == STB_TEXTEDIT_GETWIDTH_NEWLINE)
-                  break;
-               #endif
-               x += dx;
-               if (x > goal_x)
-                  break;
-               ++state->cursor;
-            }
-            stb_textedit_clamp(str, state);
-
-            state->has_preferred_x = 1;
-            state->preferred_x = goal_x;
-
-            if (sel)
-               state->select_end = state->cursor;
-         }
-         break;
-      }
-         
-      case STB_TEXTEDIT_K_UP:
-      case STB_TEXTEDIT_K_UP | STB_TEXTEDIT_K_SHIFT: {
-         StbFindState find;
-         StbTexteditRow row;
-         int i, sel = (key & STB_TEXTEDIT_K_SHIFT) != 0;
-
-         if (state->single_line) {
-            // on windows, up&down become left&right
-            key = STB_TEXTEDIT_K_LEFT | (key & STB_TEXTEDIT_K_SHIFT);
-            goto retry;
-         }
-
-         if (sel)
-            stb_textedit_prep_selection_at_cursor(state);
-         else if (STB_TEXT_HAS_SELECTION(state))
-            stb_textedit_move_to_first(state);
-
-         // compute current position of cursor point
-         stb_textedit_clamp(str, state);
-         stb_textedit_find_charpos(&find, str, state->cursor, state->single_line);
-
-         // can only go up if there's a previous row
-         if (find.prev_first != find.first_char) {
-            // now find character position up a row
-            float goal_x = state->has_preferred_x ? state->preferred_x : find.x;
-            float x;
-            state->cursor = find.prev_first;
-            STB_TEXTEDIT_LAYOUTROW(&row, str, state->cursor);
-            x = row.x0;
-            for (i=0; i < row.num_chars; ++i) {
-               float dx = STB_TEXTEDIT_GETWIDTH(str, find.prev_first, i);
-               #ifdef STB_TEXTEDIT_GETWIDTH_NEWLINE
-               if (dx == STB_TEXTEDIT_GETWIDTH_NEWLINE)
-                  break;
-               #endif
-               x += dx;
-               if (x > goal_x)
-                  break;
-               ++state->cursor;
-            }
-            stb_textedit_clamp(str, state);
-
-            state->has_preferred_x = 1;
-            state->preferred_x = goal_x;
-
-            if (sel)
-               state->select_end = state->cursor;
-         }
-         break;
-      }
-
-      case STB_TEXTEDIT_K_DELETE:
-      case STB_TEXTEDIT_K_DELETE | STB_TEXTEDIT_K_SHIFT:
-         if (STB_TEXT_HAS_SELECTION(state))
-            stb_textedit_delete_selection(str, state);
-         else {
-            int n = STB_TEXTEDIT_STRINGLEN(str);
-            if (state->cursor < n)
-               stb_textedit_delete(str, state, state->cursor, 1);
-         }
-         state->has_preferred_x = 0;
-         break;
-
-      case STB_TEXTEDIT_K_BACKSPACE:
-      case STB_TEXTEDIT_K_BACKSPACE | STB_TEXTEDIT_K_SHIFT:
-         if (STB_TEXT_HAS_SELECTION(state))
-            stb_textedit_delete_selection(str, state);
-         else {
-            stb_textedit_clamp(str, state);
-            if (state->cursor > 0) {
-               stb_textedit_delete(str, state, state->cursor-1, 1);
-               --state->cursor;
-            }
-         }
-         state->has_preferred_x = 0;
-         break;
-         
-#ifdef STB_TEXTEDIT_K_TEXTSTART2
-      case STB_TEXTEDIT_K_TEXTSTART2:
-#endif
-      case STB_TEXTEDIT_K_TEXTSTART:
-         state->cursor = state->select_start = state->select_end = 0;
-         state->has_preferred_x = 0;
-         break;
-
-#ifdef STB_TEXTEDIT_K_TEXTEND2
-      case STB_TEXTEDIT_K_TEXTEND2:
-#endif
-      case STB_TEXTEDIT_K_TEXTEND:
-         state->cursor = STB_TEXTEDIT_STRINGLEN(str);
-         state->select_start = state->select_end = 0;
-         state->has_preferred_x = 0;
-         break;
-        
-#ifdef STB_TEXTEDIT_K_TEXTSTART2
-      case STB_TEXTEDIT_K_TEXTSTART2 | STB_TEXTEDIT_K_SHIFT:
-#endif
-      case STB_TEXTEDIT_K_TEXTSTART | STB_TEXTEDIT_K_SHIFT:
-         stb_textedit_prep_selection_at_cursor(state);
-         state->cursor = state->select_end = 0;
-         state->has_preferred_x = 0;
-         break;
-
-#ifdef STB_TEXTEDIT_K_TEXTEND2
-      case STB_TEXTEDIT_K_TEXTEND2 | STB_TEXTEDIT_K_SHIFT:
-#endif
-      case STB_TEXTEDIT_K_TEXTEND | STB_TEXTEDIT_K_SHIFT:
-         stb_textedit_prep_selection_at_cursor(state);
-         state->cursor = state->select_end = STB_TEXTEDIT_STRINGLEN(str);
-         state->has_preferred_x = 0;
-         break;
-
-
-#ifdef STB_TEXTEDIT_K_LINESTART2
-      case STB_TEXTEDIT_K_LINESTART2:
-#endif
-      case STB_TEXTEDIT_K_LINESTART:
-         stb_textedit_clamp(str, state);
-         stb_textedit_move_to_first(state);
-         if (state->single_line)
-            state->cursor = 0;
-         else while (state->cursor > 0 && STB_TEXTEDIT_GETCHAR(str, state->cursor-1) != STB_TEXTEDIT_NEWLINE)
-            --state->cursor;
-         state->has_preferred_x = 0;
-         break;
-
-#ifdef STB_TEXTEDIT_K_LINEEND2
-      case STB_TEXTEDIT_K_LINEEND2:
-#endif
-      case STB_TEXTEDIT_K_LINEEND: {
-         int n = STB_TEXTEDIT_STRINGLEN(str);
-         stb_textedit_clamp(str, state);
-         stb_textedit_move_to_first(state);
-         if (state->single_line)
-             state->cursor = n;
-         else while (state->cursor < n && STB_TEXTEDIT_GETCHAR(str, state->cursor) != STB_TEXTEDIT_NEWLINE)
-             ++state->cursor;
-         state->has_preferred_x = 0;
-         break;
-      }
-
-#ifdef STB_TEXTEDIT_K_LINESTART2
-      case STB_TEXTEDIT_K_LINESTART2 | STB_TEXTEDIT_K_SHIFT:
-#endif
-      case STB_TEXTEDIT_K_LINESTART | STB_TEXTEDIT_K_SHIFT:
-         stb_textedit_clamp(str, state);
-         stb_textedit_prep_selection_at_cursor(state);
-         if (state->single_line)
-            state->cursor = 0;
-         else while (state->cursor > 0 && STB_TEXTEDIT_GETCHAR(str, state->cursor-1) != STB_TEXTEDIT_NEWLINE)
-            --state->cursor;
-         state->select_end = state->cursor;
-         state->has_preferred_x = 0;
-         break;
-
-#ifdef STB_TEXTEDIT_K_LINEEND2
-      case STB_TEXTEDIT_K_LINEEND2 | STB_TEXTEDIT_K_SHIFT:
-#endif
-      case STB_TEXTEDIT_K_LINEEND | STB_TEXTEDIT_K_SHIFT: {
-         int n = STB_TEXTEDIT_STRINGLEN(str);
-         stb_textedit_clamp(str, state);
-         stb_textedit_prep_selection_at_cursor(state);
-         if (state->single_line)
-             state->cursor = n;
-         else while (state->cursor < n && STB_TEXTEDIT_GETCHAR(str, state->cursor) != STB_TEXTEDIT_NEWLINE)
-            ++state->cursor;
-         state->select_end = state->cursor;
-         state->has_preferred_x = 0;
-         break;
-      }
-
-// @TODO:
-//    STB_TEXTEDIT_K_PGUP      - move cursor up a page
-//    STB_TEXTEDIT_K_PGDOWN    - move cursor down a page
-   }
-}
-
-/////////////////////////////////////////////////////////////////////////////
-//
-//      Undo processing
-//
-// @OPTIMIZE: the undo/redo buffer should be circular
-
-static void stb_textedit_flush_redo(StbUndoState *state)
-{
-   state->redo_point = STB_TEXTEDIT_UNDOSTATECOUNT;
-   state->redo_char_point = STB_TEXTEDIT_UNDOCHARCOUNT;
-}
-
-// discard the oldest entry in the undo list
-static void stb_textedit_discard_undo(StbUndoState *state)
-{
-   if (state->undo_point > 0) {
-      // if the 0th undo state has characters, clean those up
-      if (state->undo_rec[0].char_storage >= 0) {
-         int n = state->undo_rec[0].insert_length, i;
-         // delete n characters from all other records
-         state->undo_char_point = state->undo_char_point - (short) n;  // vsnet05
-         STB_TEXTEDIT_memmove(state->undo_char, state->undo_char + n, (size_t) ((size_t)state->undo_char_point*sizeof(STB_TEXTEDIT_CHARTYPE)));
-         for (i=0; i < state->undo_point; ++i)
-            if (state->undo_rec[i].char_storage >= 0)
-               state->undo_rec[i].char_storage = state->undo_rec[i].char_storage - (short) n; // vsnet05 // @OPTIMIZE: get rid of char_storage and infer it
-      }
-      --state->undo_point;
-      STB_TEXTEDIT_memmove(state->undo_rec, state->undo_rec+1, (size_t) ((size_t)state->undo_point*sizeof(state->undo_rec[0])));
-   }
-}
-
-// discard the oldest entry in the redo list--it's bad if this
-// ever happens, but because undo & redo have to store the actual
-// characters in different cases, the redo character buffer can
-// fill up even though the undo buffer didn't
-static void stb_textedit_discard_redo(StbUndoState *state)
-{
-   int k = STB_TEXTEDIT_UNDOSTATECOUNT-1;
-
-   if (state->redo_point <= k) {
-      // if the k'th undo state has characters, clean those up
-      if (state->undo_rec[k].char_storage >= 0) {
-         int n = state->undo_rec[k].insert_length, i;
-         // delete n characters from all other records
-         state->redo_char_point = state->redo_char_point + (short) n; // vsnet05
-         STB_TEXTEDIT_memmove(state->undo_char + state->redo_char_point, state->undo_char + state->redo_char_point-n, (size_t) ((size_t)(STB_TEXTEDIT_UNDOCHARCOUNT - state->redo_char_point)*sizeof(STB_TEXTEDIT_CHARTYPE)));
-         for (i=state->redo_point; i < k; ++i)
-            if (state->undo_rec[i].char_storage >= 0)
-               state->undo_rec[i].char_storage = state->undo_rec[i].char_storage + (short) n; // vsnet05
-      }
-      STB_TEXTEDIT_memmove(state->undo_rec + state->redo_point, state->undo_rec + state->redo_point-1, (size_t) ((size_t)(STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_point)*sizeof(state->undo_rec[0])));
-      ++state->redo_point;
-   }
-}
-
-static StbUndoRecord *stb_text_create_undo_record(StbUndoState *state, int numchars)
-{
-   // any time we create a new undo record, we discard redo
-   stb_textedit_flush_redo(state);
-
-   // if we have no free records, we have to make room, by sliding the
-   // existing records down
-   if (state->undo_point == STB_TEXTEDIT_UNDOSTATECOUNT)
-      stb_textedit_discard_undo(state);
-
-   // if the characters to store won't possibly fit in the buffer, we can't undo
-   if (numchars > STB_TEXTEDIT_UNDOCHARCOUNT) {
-      state->undo_point = 0;
-      state->undo_char_point = 0;
-      return NULL;
-   }
-
-   // if we don't have enough free characters in the buffer, we have to make room
-   while (state->undo_char_point + numchars > STB_TEXTEDIT_UNDOCHARCOUNT)
-      stb_textedit_discard_undo(state);
-
-   return &state->undo_rec[state->undo_point++];
-}
-
-static STB_TEXTEDIT_CHARTYPE *stb_text_createundo(StbUndoState *state, int pos, int insert_len, int delete_len)
-{
-   StbUndoRecord *r = stb_text_create_undo_record(state, insert_len);
-   if (r == NULL)
-      return NULL;
-
-   r->where = pos;
-   r->insert_length = (short) insert_len;
-   r->delete_length = (short) delete_len;
-
-   if (insert_len == 0) {
-      r->char_storage = -1;
-      return NULL;
-   } else {
-      r->char_storage = state->undo_char_point;
-      state->undo_char_point = state->undo_char_point + (short) insert_len;
-      return &state->undo_char[r->char_storage];
-   }
-}
-
-static void stb_text_undo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
-{
-   StbUndoState *s = &state->undostate;
-   StbUndoRecord u, *r;
-   if (s->undo_point == 0)
-      return;
-
-   // we need to do two things: apply the undo record, and create a redo record
-   u = s->undo_rec[s->undo_point-1];
-   r = &s->undo_rec[s->redo_point-1];
-   r->char_storage = -1;
-
-   r->insert_length = u.delete_length;
-   r->delete_length = u.insert_length;
-   r->where = u.where;
-
-   if (u.delete_length) {
-      // if the undo record says to delete characters, then the redo record will
-      // need to re-insert the characters that get deleted, so we need to store
-      // them.
-
-      // there are three cases:
-      //    there's enough room to store the characters
-      //    characters stored for *redoing* don't leave room for redo
-      //    characters stored for *undoing* don't leave room for redo
-      // if the last is true, we have to bail
-
-      if (s->undo_char_point + u.delete_length >= STB_TEXTEDIT_UNDOCHARCOUNT) {
-         // the undo records take up too much character space; there's no space to store the redo characters
-         r->insert_length = 0;
-      } else {
-         int i;
-
-         // there's definitely room to store the characters eventually
-         while (s->undo_char_point + u.delete_length > s->redo_char_point) {
-            // there's currently not enough room, so discard a redo record
-            stb_textedit_discard_redo(s);
-            // should never happen:
-            if (s->redo_point == STB_TEXTEDIT_UNDOSTATECOUNT)
-               return;
-         }
-         r = &s->undo_rec[s->redo_point-1];
-
-         r->char_storage = s->redo_char_point - u.delete_length;
-         s->redo_char_point = s->redo_char_point - (short) u.delete_length;
-
-         // now save the characters
-         for (i=0; i < u.delete_length; ++i)
-            s->undo_char[r->char_storage + i] = STB_TEXTEDIT_GETCHAR(str, u.where + i);
-      }
-
-      // now we can carry out the deletion
-      STB_TEXTEDIT_DELETECHARS(str, u.where, u.delete_length);
-   }
-
-   // check type of recorded action:
-   if (u.insert_length) {
-      // easy case: was a deletion, so we need to insert n characters
-      STB_TEXTEDIT_INSERTCHARS(str, u.where, &s->undo_char[u.char_storage], u.insert_length);
-      s->undo_char_point -= u.insert_length;
-   }
-
-   state->cursor = u.where + u.insert_length;
-
-   s->undo_point--;
-   s->redo_point--;
-}
-
-static void stb_text_redo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
-{
-   StbUndoState *s = &state->undostate;
-   StbUndoRecord *u, r;
-   if (s->redo_point == STB_TEXTEDIT_UNDOSTATECOUNT)
-      return;
-
-   // we need to do two things: apply the redo record, and create an undo record
-   u = &s->undo_rec[s->undo_point];
-   r = s->undo_rec[s->redo_point];
-
-   // we KNOW there must be room for the undo record, because the redo record
-   // was derived from an undo record
-
-   u->delete_length = r.insert_length;
-   u->insert_length = r.delete_length;
-   u->where = r.where;
-   u->char_storage = -1;
-
-   if (r.delete_length) {
-      // the redo record requires us to delete characters, so the undo record
-      // needs to store the characters
-
-      if (s->undo_char_point + u->insert_length > s->redo_char_point) {
-         u->insert_length = 0;
-         u->delete_length = 0;
-      } else {
-         int i;
-         u->char_storage = s->undo_char_point;
-         s->undo_char_point = s->undo_char_point + u->insert_length;
-
-         // now save the characters
-         for (i=0; i < u->insert_length; ++i)
-            s->undo_char[u->char_storage + i] = STB_TEXTEDIT_GETCHAR(str, u->where + i);
-      }
-
-      STB_TEXTEDIT_DELETECHARS(str, r.where, r.delete_length);
-   }
-
-   if (r.insert_length) {
-      // easy case: need to insert n characters
-      STB_TEXTEDIT_INSERTCHARS(str, r.where, &s->undo_char[r.char_storage], r.insert_length);
-      s->redo_char_point += r.insert_length;
-   }
-
-   state->cursor = r.where + r.insert_length;
-
-   s->undo_point++;
-   s->redo_point++;
-}
-
-static void stb_text_makeundo_insert(STB_TexteditState *state, int where, int length)
-{
-   stb_text_createundo(&state->undostate, where, 0, length);
-}
-
-static void stb_text_makeundo_delete(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int length)
-{
-   int i;
-   STB_TEXTEDIT_CHARTYPE *p = stb_text_createundo(&state->undostate, where, length, 0);
-   if (p) {
-      for (i=0; i < length; ++i)
-         p[i] = STB_TEXTEDIT_GETCHAR(str, where+i);
-   }
-}
-
-static void stb_text_makeundo_replace(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, int where, int old_length, int new_length)
-{
-   int i;
-   STB_TEXTEDIT_CHARTYPE *p = stb_text_createundo(&state->undostate, where, old_length, new_length);
-   if (p) {
-      for (i=0; i < old_length; ++i)
-         p[i] = STB_TEXTEDIT_GETCHAR(str, where+i);
-   }
-}
-
-// reset the state to default
-static void stb_textedit_clear_state(STB_TexteditState *state, int is_single_line)
-{
-   state->undostate.undo_point = 0;
-   state->undostate.undo_char_point = 0;
-   state->undostate.redo_point = STB_TEXTEDIT_UNDOSTATECOUNT;
-   state->undostate.redo_char_point = STB_TEXTEDIT_UNDOCHARCOUNT;
-   state->select_end = state->select_start = 0;
-   state->cursor = 0;
-   state->has_preferred_x = 0;
-   state->preferred_x = 0;
-   state->cursor_at_end_of_line = 0;
-   state->initialized = 1;
-   state->single_line = (unsigned char) is_single_line;
-   state->insert_mode = 0;
-}
-
-// API initialize
-static void stb_textedit_initialize_state(STB_TexteditState *state, int is_single_line)
-{
-   stb_textedit_clear_state(state, is_single_line);
-}
-#endif//STB_TEXTEDIT_IMPLEMENTATION