Update Dear ImGui to 1.92.9b (docking)

From 947aa9c97 to 98a66d8c8 on the docking branch - the latest release there,
plus the viewport fixes that landed on top of it. The only local changes to
upstream files are the "#undef new" hack at the top of imgui.h and enabling
IMGUI_DISABLE_OBSOLETE_FUNCTIONS in imconfig.h; both re-applied.

1.92 reworked fonts and textures, so the thin3d backend now advertises
ImGuiBackendFlags_RendererHasTextures and creates/updates/destroys imgui's
textures on request instead of building the font atlas itself. ImTextureIDs
below 256 now index those, above it the per-frame temp textures as before.
thin3d can't replace part of a texture yet, so an update re-uploads the whole
thing - fine for an atlas that only changes when a new glyph appears.

Also: AddRect() swapped its thickness and flags parameters in 1.92.8.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

ext/imgui/imconfig.h

@@ -15,20 +15,21 @@
 #pragma once
 
 //---- Define assertion handler. Defaults to calling assert().
-// If your macro uses multiple statements, make sure is enclosed in a 'do { .. } while (0)' block so it can be used as a single statement.
+// - If your macro uses multiple statements, make sure is enclosed in a 'do { .. } while (0)' block so it can be used as a single statement.
+// - Compiling with NDEBUG will usually strip out assert() to nothing, which is NOT recommended because we use asserts to notify of programmer mistakes.
 //#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
 //#define IM_ASSERT(_EXPR)  ((void)(_EXPR))     // Disable asserts
 
 //---- Define attributes of all API symbols declarations, e.g. for DLL under Windows
 // Using Dear ImGui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
-// DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
-// for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
-//#define IMGUI_API __declspec( dllexport )
-//#define IMGUI_API __declspec( dllimport )
+// - Windows DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
+//   for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
+//#define IMGUI_API __declspec(dllexport)                   // MSVC Windows: DLL export
+//#define IMGUI_API __declspec(dllimport)                   // MSVC Windows: DLL import
+//#define IMGUI_API __attribute__((visibility("default")))  // GCC/Clang: override visibility when set is hidden
 
 //---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to clean your code of obsolete function/names.
 #define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-//#define IMGUI_DISABLE_OBSOLETE_KEYIO                      // 1.87+ disable legacy io.KeyMap[]+io.KeysDown[] in favor io.AddKeyEvent(). This is automatically done by IMGUI_DISABLE_OBSOLETE_FUNCTIONS.
 
 //---- Disable all of Dear ImGui or don't implement standard windows/tools.
 // It is very strongly recommended to NOT disable the demo windows and debug tool during development. They are extremely useful in day to day work. Please read comments in imgui_demo.cpp.
@@ -42,21 +43,32 @@
 //#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS         // [Win32] [Default with non-Visual Studio compilers] Don't implement default IME handler (won't require imm32.lib/.a)
 //#define IMGUI_DISABLE_WIN32_FUNCTIONS                     // [Win32] Won't use and link with any Win32 function (clipboard, IME).
 //#define IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS      // [OSX] Implement default OSX clipboard handler (need to link with '-framework ApplicationServices', this is why this is not the default).
+//#define IMGUI_DISABLE_TIME_FUNCTIONS                      // Don't setup default platform_io.Platform_SessionDate value using time(), localtime_r().
+//#define IMGUI_DISABLE_DEFAULT_SHELL_FUNCTIONS             // Don't implement default platform_io.Platform_OpenInShellFn() handler (Win32: ShellExecute(), require shell32.lib/.a, Mac/Linux: use system("")).
 //#define IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS            // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself (e.g. if you don't want to link with vsnprintf)
 //#define IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS              // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 so you can implement them yourself.
 //#define IMGUI_DISABLE_FILE_FUNCTIONS                      // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle at all (replace them with dummies)
 //#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
 //#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free() to avoid linking with them. You will need to call ImGui::SetAllocatorFunctions().
+//#define IMGUI_DISABLE_DEFAULT_FONT                        // Disable default embedded fonts (ProggyClean + ProggyForever). Remove ~9 KB + ~14 KB from output binary. AddFontDefaultXXX() functions will assert.
+//#define IMGUI_DISABLE_DEFAULT_FONT_BITMAP                 // Disable default embedded bitmap font (ProggyClean). Remove ~9 KB from output binary. AddFontDefaultBitmap() will assert.
+//#define IMGUI_DISABLE_DEFAULT_FONT_VECTOR                 // Disable default embedded vector font (ProggyForever), Remove ~14 KB from output binary. AddFontDefaultVector() will assert.
 //#define IMGUI_DISABLE_SSE                                 // Disable use of SSE intrinsics even if available
 
+//---- Enable Test Engine / Automation features.
+//#define IMGUI_ENABLE_TEST_ENGINE                          // Enable imgui_test_engine hooks. Generally set automatically by include "imgui_te_imconfig.h", see Test Engine for details.
+
 //---- Include imgui_user.h at the end of imgui.h as a convenience
 // May be convenient for some users to only explicitly include vanilla imgui.h and have extra stuff included.
 //#define IMGUI_INCLUDE_IMGUI_USER_H
 //#define IMGUI_USER_H_FILENAME         "my_folder/my_imgui_user.h"
 
-//---- Pack colors to BGRA8 instead of RGBA8 (to avoid converting from one to another)
+//---- Pack vertex colors as BGRA8 instead of RGBA8 (to avoid converting from one to another). Need dedicated backend support.
 //#define IMGUI_USE_BGRA_PACKED_COLOR
 
+//---- Use legacy CRC32-adler tables (used before 1.91.6), in order to preserve old .ini data that you cannot afford to invalidate.
+//#define IMGUI_USE_LEGACY_CRC32_ADLER
+
 //---- Use 32-bit for ImWchar (default is 16-bit) to support Unicode planes 1-16. (e.g. point beyond 0xFFFF like emoticons, dingbats, symbols, shapes, ancient languages, etc...)
 //#define IMGUI_USE_WCHAR32
 
@@ -75,13 +87,16 @@
 
 //---- Use FreeType to build and rasterize the font atlas (instead of stb_truetype which is embedded by default in Dear ImGui)
 // Requires FreeType headers to be available in the include path. Requires program to be compiled with 'misc/freetype/imgui_freetype.cpp' (in this repository) + the FreeType library (not provided).
+// Note that imgui_freetype.cpp may be used _without_ this define, if you manually call ImFontAtlas::SetFontLoader(). The define is simply a convenience.
 // On Windows you may use vcpkg with 'vcpkg install freetype --triplet=x64-windows' + 'vcpkg integrate install'.
 //#define IMGUI_ENABLE_FREETYPE
 
-//---- Use FreeType+lunasvg library to render OpenType SVG fonts (SVGinOT)
-// Requires lunasvg headers to be available in the include path + program to be linked with the lunasvg library (not provided).
+//---- Use FreeType + plutosvg or lunasvg to render OpenType SVG fonts (SVGinOT)
 // Only works in combination with IMGUI_ENABLE_FREETYPE.
-// (implementation is based on Freetype's rsvg-port.c which is licensed under CeCILL-C Free Software License Agreement)
+// - plutosvg is currently easier to install, as e.g. it is part of vcpkg. It will support more fonts and may load them faster. See misc/freetype/README for instructions.
+// - Both require headers to be available in the include path + program to be linked with the library code (not provided).
+// - (note: lunasvg implementation is based on Freetype's rsvg-port.c which is licensed under CeCILL-C Free Software License Agreement)
+//#define IMGUI_ENABLE_FREETYPE_PLUTOSVG
 //#define IMGUI_ENABLE_FREETYPE_LUNASVG
 
 //---- Use stb_truetype to build and rasterize the font atlas (default)
@@ -119,6 +134,10 @@
 //#define IM_DEBUG_BREAK  IM_ASSERT(0)
 //#define IM_DEBUG_BREAK  __debugbreak()
 
+//---- Debug Tools: Enable highlight ID conflicts _before_ hovering items. When io.ConfigDebugHighlightIdConflicts is set.
+// (THIS WILL SLOW DOWN DEAR IMGUI. Only use occasionally and disable after use)
+//#define IMGUI_DEBUG_HIGHLIGHT_ALL_ID_CONFLICTS
+
 //---- Debug Tools: Enable slower asserts
 //#define IMGUI_DEBUG_PARANOID
 

ext/imgui/imgui_impl_thin3d.cpp

@@ -33,11 +33,16 @@ struct RegisteredTexture {
 
 struct BackendData {
 	Draw::SamplerState *fontSampler = nullptr;
-	Draw::Texture *fontImage = nullptr;
 	Draw::Pipeline *pipelines[(int)ImGuiPipeline::Count]{};
 	std::vector<RegisteredTexture> tempTextures;
+	// Textures imgui asked us to create (since 1.92 the font atlas is one of these, and there can
+	// be more than one as it grows). Indexed by ImTextureID - 1, so entries can go null on destroy
+	// without shifting the rest. Slots are reused.
+	std::vector<Draw::Texture *> imguiTextures;
 };
 
+// ImTextureID layout: 0 is ImTextureID_Invalid, 1..TEX_ID_OFFSET-1 index imguiTextures, and
+// TEX_ID_OFFSET and up index the per-frame tempTextures.
 #define TEX_ID_OFFSET 256
 
 // Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts
@@ -47,6 +52,78 @@ static BackendData *ImGui_ImplThin3d_GetBackendData() {
 	return ImGui::GetCurrentContext() ? (BackendData *)ImGui::GetIO().BackendRendererUserData : nullptr;
 }
 
+// Since 1.92 imgui owns its textures (the font atlas, and any more it needs as glyphs get
+// rasterized on demand) and asks the backend to create, refresh and destroy them. thin3d can only
+// replace a whole mip level, not a sub-rectangle, so an update re-uploads everything - which is
+// fine, since these only change when a new glyph shows up.
+static void ImGui_ImplThin3d_UpdateTexture(Draw::DrawContext *draw, ImTextureData *tex) {
+	BackendData *bd = ImGui_ImplThin3d_GetBackendData();
+
+	switch (tex->Status) {
+	case ImTextureStatus_WantCreate:
+	{
+		_dbg_assert_(tex->Format == ImTextureFormat_RGBA32 && tex->BytesPerPixel == 4);
+
+		Draw::TextureDesc desc{};
+		desc.width = tex->Width;
+		desc.height = tex->Height;
+		desc.mipLevels = 1;
+		desc.format = Draw::DataFormat::R8G8B8A8_UNORM;
+		desc.type = Draw::TextureType::LINEAR2D;
+		desc.swizzle = Draw::TextureSwizzle::DEFAULT;
+		desc.depth = 1;
+		desc.tag = "imgui-texture";
+		desc.initData.push_back((const uint8_t *)tex->GetPixels());
+		Draw::Texture *created = draw->CreateTexture(desc);
+		if (!created) {
+			ERROR_LOG(Log::System, "imgui: failed to create a %dx%d texture", tex->Width, tex->Height);
+			return;
+		}
+
+		// Reuse a slot freed by an earlier destroy, so a long session doesn't grow the vector.
+		size_t index = 0;
+		while (index < bd->imguiTextures.size() && bd->imguiTextures[index]) {
+			index++;
+		}
+		if (index == bd->imguiTextures.size()) {
+			bd->imguiTextures.push_back(created);
+		} else {
+			bd->imguiTextures[index] = created;
+		}
+		_dbg_assert_(index + 1 < TEX_ID_OFFSET);
+
+		tex->SetTexID((ImTextureID)(index + 1));
+		tex->SetStatus(ImTextureStatus_OK);
+		break;
+	}
+	case ImTextureStatus_WantUpdates:
+	{
+		const size_t index = (size_t)tex->GetTexID() - 1;
+		if (index >= bd->imguiTextures.size() || !bd->imguiTextures[index]) {
+			ERROR_LOG(Log::System, "imgui: asked to update texture %d, which we don't have", (int)tex->GetTexID());
+			return;
+		}
+		const uint8_t *data = (const uint8_t *)tex->GetPixels();
+		draw->UpdateTextureLevels(bd->imguiTextures[index], &data, nullptr, 1);
+		tex->SetStatus(ImTextureStatus_OK);
+		break;
+	}
+	case ImTextureStatus_WantDestroy:
+	{
+		const size_t index = (size_t)tex->GetTexID() - 1;
+		if (index < bd->imguiTextures.size() && bd->imguiTextures[index]) {
+			bd->imguiTextures[index]->Release();
+			bd->imguiTextures[index] = nullptr;
+		}
+		tex->SetTexID(ImTextureID_Invalid);
+		tex->SetStatus(ImTextureStatus_Destroyed);
+		break;
+	}
+	default:
+		break;
+	}
+}
+
 // Render function
 void ImGui_ImplThin3d_RenderDrawData(ImDrawData* draw_data, Draw::DrawContext *draw) {
 	if (!draw_data) {
@@ -61,6 +138,16 @@ void ImGui_ImplThin3d_RenderDrawData(ImDrawData* draw_data, Draw::DrawContext *d
 	}
 
 	BackendData* bd = ImGui_ImplThin3d_GetBackendData();
+
+	// Create/refresh/destroy whatever imgui needs before we start referring to the textures.
+	if (draw_data->Textures != nullptr) {
+		for (ImTextureData *tex : *draw_data->Textures) {
+			if (tex->Status != ImTextureStatus_OK) {
+				ImGui_ImplThin3d_UpdateTexture(draw, tex);
+			}
+		}
+	}
+
 	draw->BindSamplerStates(0, 1, &bd->fontSampler);
 
 	// Setup viewport
@@ -96,7 +183,7 @@ void ImGui_ImplThin3d_RenderDrawData(ImDrawData* draw_data, Draw::DrawContext *d
 	Draw::Aspect boundAspect = Draw::Aspect::COLOR_BIT;
 
 	// Render command lists
-	for (int n = 0; n < draw_data->CmdListsCount; n++) {
+	for (int n = 0; n < draw_data->CmdLists.Size; n++) {
 		const ImDrawList* cmd_list = draw_data->CmdLists[n];
 		draws.clear();
 		for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++) {
@@ -105,15 +192,22 @@ void ImGui_ImplThin3d_RenderDrawData(ImDrawData* draw_data, Draw::DrawContext *d
 			_dbg_assert_(pcmd->UserCallback == nullptr);
 
 			// Update the texture pointers.
-			if (!pcmd->TextureId) {
-				// Default
-				boundTexture = bd->fontImage;
+			const ImTextureID texId = pcmd->GetTexID();
+			if (texId < TEX_ID_OFFSET) {
+				// One of imgui's own textures - the font atlas, most of the time.
+				const size_t index = (size_t)texId - 1;
+				if (texId == ImTextureID_Invalid || index >= bd->imguiTextures.size() || !bd->imguiTextures[index]) {
+					WARN_LOG(Log::System, "Missing imgui texture %d", (int)texId);
+					continue;
+				}
+				boundTexture = bd->imguiTextures[index];
 				boundNativeTexture = nullptr;
 				boundFBAsTexture = nullptr;
+				boundAspect = Draw::Aspect::COLOR_BIT;
 				boundPipeline = bd->pipelines[0];
 				boundSampler = bd->fontSampler;
 			} else {
-				size_t index = (size_t)pcmd->TextureId - TEX_ID_OFFSET;
+				size_t index = (size_t)texId - TEX_ID_OFFSET;
 				if (index >= bd->tempTextures.size()) {
 					WARN_LOG(Log::System, "Missing temp texture %d (out of %d)", (int)index, (int)bd->tempTextures.size());
 					continue;
@@ -245,40 +339,27 @@ bool ImGui_ImplThin3d_CreateDeviceObjects(Draw::DrawContext *draw) {
 		rasterNoCull->Release();
 	}
 
-	if (!bd->fontImage) {
-		ImGuiIO& io = ImGui::GetIO();
-		BackendData* bd = ImGui_ImplThin3d_GetBackendData();
-
-		unsigned char* pixels;
-		int width, height;
-		io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
-		size_t upload_size = width * height * 4 * sizeof(char);
-
-		Draw::TextureDesc desc{};
-		desc.width = width;
-		desc.height = height;
-		desc.mipLevels = 1;
-		desc.format = Draw::DataFormat::R8G8B8A8_UNORM;
-		desc.type = Draw::TextureType::LINEAR2D;
-		desc.swizzle = Draw::TextureSwizzle::DEFAULT;
-		desc.depth = 1;
-		desc.tag = "imgui-font";
-		desc.initData.push_back((const uint8_t *)pixels);
-		bd->fontImage = draw->CreateTexture(desc);
-		io.Fonts->SetTexID(0);
-	}
-
+	// The font atlas isn't built here any more - since 1.92 imgui hands us its textures through
+	// ImGui_ImplThin3d_UpdateTexture as it needs them.
 	return true;
 }
 
 void ImGui_ImplThin3d_DestroyDeviceObjects() {
-	ImGuiIO& io = ImGui::GetIO();
 	BackendData* bd = ImGui_ImplThin3d_GetBackendData();
-	if (bd->fontImage) {
-		bd->fontImage->Release();
-		bd->fontImage = nullptr;
-		io.Fonts->SetTexID(0);
+	// Hand imgui's textures back. Setting the status to Destroyed lets it ask for them again if
+	// the backend comes back up, which is what happens on a device loss or a backend switch.
+	for (ImTextureData *tex : ImGui::GetPlatformIO().Textures) {
+		if (tex->RefCount == 1) {
+			const size_t index = (size_t)tex->GetTexID() - 1;
+			if (tex->GetTexID() != ImTextureID_Invalid && index < bd->imguiTextures.size() && bd->imguiTextures[index]) {
+				bd->imguiTextures[index]->Release();
+				bd->imguiTextures[index] = nullptr;
+			}
+			tex->SetTexID(ImTextureID_Invalid);
+			tex->SetStatus(ImTextureStatus_Destroyed);
+		}
 	}
+	bd->imguiTextures.clear();
 	for (int i = 0; i < ARRAY_SIZE(bd->pipelines); i++) {
 		if (bd->pipelines[i]) {
 			bd->pipelines[i]->Release();
@@ -323,12 +404,15 @@ bool ImGui_ImplThin3d_Init(Draw::DrawContext *draw,
 	io.BackendRendererUserData = (void*)bd;
 	io.BackendRendererName = "imgui_impl_thin3d";
 	io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+	io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures;   // We create/update/destroy imgui's textures on request - see ImGui_ImplThin3d_UpdateTexture.
 	ImGui_ImplThin3d_CreateDeviceObjects(draw);
 	return true;
 }
 
 void ImGui_PushFixedFont() {
-	ImGui::PushFont(g_fixedFont);
+	// LegacySize is the size the font was added at, which is what PushFont used before 1.92 made
+	// the size an explicit parameter.
+	ImGui::PushFont(g_fixedFont, g_fixedFont->LegacySize);
 }
 
 void ImGui_PopFont() {

ext/imgui/imstb_rectpack.h

@@ -315,7 +315,7 @@ static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0
       if (node->y > min_y) {
          // raise min_y higher.
          // we've accounted for all waste up to min_y,
-         // but we'll now add more waste for everything we've visted
+         // but we'll now add more waste for everything we've visited
          waste_area += visited_width * (node->y - min_y);
          min_y = node->y;
          // the first time through, visited_width might be reduced
@@ -470,7 +470,7 @@ static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, i
 
    // insert the new node into the right starting point, and
    // let 'cur' point to the remaining nodes needing to be
-   // stiched back in
+   // stitched back in
 
    cur = *res.prev_link;
    if (cur->x < res.x) {

ext/imgui/imstb_textedit.h

@@ -5,7 +5,8 @@
 // - Fix in stb_textedit_find_charpos to handle last line (see https://github.com/ocornut/imgui/issues/6000 + #6783)
 // - Added name to struct or it may be forward declared in our code.
 // - Added UTF-8 support (see https://github.com/nothings/stb/issues/188 + https://github.com/ocornut/imgui/pull/7925)
-// Grep for [DEAR IMGUI] to find the changes.
+// - Changed STB_TEXTEDIT_INSERTCHARS() to return inserted count (instead of 0/1 bool), allowing partial insertion.
+// Grep for [DEAR IMGUI] to find some changes.
 // - Also renamed macros used or defined outside of IMSTB_TEXTEDIT_IMPLEMENTATION block from STB_TEXTEDIT_* to IMSTB_TEXTEDIT_*
 
 // stb_textedit.h - v1.14  - public domain - Sean Barrett
@@ -39,6 +40,7 @@
 //
 // VERSION HISTORY
 //
+//   !!!! (2025-10-23) changed STB_TEXTEDIT_INSERTCHARS() to return inserted count (instead of 0/1 bool), allowing partial insertion.
 //   1.14 (2021-07-11) page up/down, various fixes
 //   1.13 (2019-02-07) fix bug in undo size management
 //   1.12 (2018-01-29) user can change STB_TEXTEDIT_KEYTYPE, fix redo to avoid crash
@@ -141,12 +143,14 @@
 //                                        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)
+//                                        (not supported if you want to use UTF-8, see below)
 //    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_INSERTCHARS(obj,i,c*,n)   try to insert n characters at i (pointed to by STB_TEXTEDIT_CHARTYPE*)
+//                                           returns number of characters actually inserted. [DEAR IMGUI]
 //
 //    STB_TEXTEDIT_K_SHIFT       a power of two that is or'd in to a keyboard input to represent the shift key
 //
@@ -178,6 +182,13 @@
 //    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
 //
+// To support UTF-8:
+//
+//    STB_TEXTEDIT_GETPREVCHARINDEX      returns index of previous character
+//    STB_TEXTEDIT_GETNEXTCHARINDEX      returns index of next character
+//    Do NOT define STB_TEXTEDIT_KEYTOTEXT.
+//    Instead, call stb_textedit_text() directly for text contents.
+//
 // 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,
@@ -250,8 +261,10 @@
 //          if the STB_TEXTEDIT_KEYTOTEXT function is defined, selected keys are
 //          transformed into text and stb_textedit_text() is automatically called.
 //
-//      text: [DEAR IMGUI] added 2024-09
-//          call this to text inputs sent to the textfield.
+//      text: (added 2025)
+//          call this to directly send text input the textfield, which is required
+//          for UTF-8 support, because stb_textedit_key() + STB_TEXTEDIT_KEYTOTEXT()
+//          cannot infer text length.
 //
 //
 //   When rendering, you can read the cursor position and selection state from
@@ -400,6 +413,16 @@ typedef struct
 #define IMSTB_TEXTEDIT_memmove memmove
 #endif
 
+// [DEAR IMGUI]
+// Functions must be implemented for UTF8 support
+// Code in this file that uses those functions is modified for [DEAR IMGUI] and deviates from the original stb_textedit.
+// There is not necessarily a '[DEAR IMGUI]' at the usage sites.
+#ifndef IMSTB_TEXTEDIT_GETPREVCHARINDEX
+#define IMSTB_TEXTEDIT_GETPREVCHARINDEX(OBJ, IDX) ((IDX) - 1)
+#endif
+#ifndef IMSTB_TEXTEDIT_GETNEXTCHARINDEX
+#define IMSTB_TEXTEDIT_GETNEXTCHARINDEX(OBJ, IDX) ((IDX) + 1)
+#endif
 
 /////////////////////////////////////////////////////////////////////////////
 //
@@ -407,7 +430,7 @@ typedef struct
 //
 
 // traverse the layout to locate the nearest character to a display position
-static int stb_text_locate_coord(IMSTB_TEXTEDIT_STRING *str, float x, float y)
+static int stb_text_locate_coord(IMSTB_TEXTEDIT_STRING *str, float x, float y, int* out_side_on_line)
 {
    StbTexteditRow r;
    int n = STB_TEXTEDIT_STRINGLEN(str);
@@ -417,6 +440,7 @@ static int stb_text_locate_coord(IMSTB_TEXTEDIT_STRING *str, float x, float y)
    r.x0 = r.x1 = 0;
    r.ymin = r.ymax = 0;
    r.num_chars = 0;
+   *out_side_on_line = 0;
 
    // search rows to find one that straddles 'y'
    while (i < n) {
@@ -436,7 +460,10 @@ static int stb_text_locate_coord(IMSTB_TEXTEDIT_STRING *str, float x, float y)
 
    // below all text, return 'after' last character
    if (i >= n)
+   {
+      *out_side_on_line = 1;
       return n;
+   }
 
    // check if it's before the beginning of the line
    if (x < r.x0)
@@ -449,6 +476,7 @@ static int stb_text_locate_coord(IMSTB_TEXTEDIT_STRING *str, float x, float y)
       for (k=0; k < r.num_chars; k = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, i + k) - i) {
          float w = STB_TEXTEDIT_GETWIDTH(str, i, k);
          if (x < prev_x+w) {
+            *out_side_on_line = (k == 0) ? 0 : 1;
             if (x < prev_x+w/2)
                return k+i;
             else
@@ -460,6 +488,7 @@ static int stb_text_locate_coord(IMSTB_TEXTEDIT_STRING *str, float x, float y)
    }
 
    // if the last character is a newline, return that. otherwise return 'after' the last character
+   *out_side_on_line = 1;
    if (STB_TEXTEDIT_GETCHAR(str, i+r.num_chars-1) == STB_TEXTEDIT_NEWLINE)
       return i+r.num_chars-1;
    else
@@ -471,6 +500,7 @@ static void stb_textedit_click(IMSTB_TEXTEDIT_STRING *str, STB_TexteditState *st
 {
    // In single-line mode, just always make y = 0. This lets the drag keep working if the mouse
    // goes off the top or bottom of the text
+   int side_on_line;
    if( state->single_line )
    {
       StbTexteditRow r;
@@ -478,16 +508,18 @@ static void stb_textedit_click(IMSTB_TEXTEDIT_STRING *str, STB_TexteditState *st
       y = r.ymin;
    }
 
-   state->cursor = stb_text_locate_coord(str, x, y);
+   state->cursor = stb_text_locate_coord(str, x, y, &side_on_line);
    state->select_start = state->cursor;
    state->select_end = state->cursor;
    state->has_preferred_x = 0;
+   str->LastMoveDirectionLR = (ImS8)(side_on_line ? ImGuiDir_Right : ImGuiDir_Left);
 }
 
 // API drag: on mouse drag, move the cursor and selection endpoint to the clicked location
 static void stb_textedit_drag(IMSTB_TEXTEDIT_STRING *str, STB_TexteditState *state, float x, float y)
 {
    int p = 0;
+   int side_on_line;
 
    // In single-line mode, just always make y = 0. This lets the drag keep working if the mouse
    // goes off the top or bottom of the text
@@ -501,8 +533,9 @@ static void stb_textedit_drag(IMSTB_TEXTEDIT_STRING *str, STB_TexteditState *sta
    if (state->select_start == state->select_end)
       state->select_start = state->cursor;
 
-   p = stb_text_locate_coord(str, x, y);
+   p = stb_text_locate_coord(str, x, y, &side_on_line);
    state->cursor = state->select_end = p;
+   str->LastMoveDirectionLR = (ImS8)(side_on_line ? ImGuiDir_Right : ImGuiDir_Left);
 }
 
 /////////////////////////////////////////////////////////////////////////////
@@ -552,6 +585,8 @@ static void stb_textedit_find_charpos(StbFindState *find, IMSTB_TEXTEDIT_STRING
       STB_TEXTEDIT_LAYOUTROW(&r, str, i);
       if (n < i + r.num_chars)
          break;
+      if (str->LastMoveDirectionLR == ImGuiDir_Right && str->Stb->cursor > 0 && str->Stb->cursor == i + r.num_chars && STB_TEXTEDIT_GETCHAR(str, i + r.num_chars - 1) != STB_TEXTEDIT_NEWLINE) // [DEAR IMGUI] Wrapping point handling
+         break;
       if (i + r.num_chars == z && z > 0 && STB_TEXTEDIT_GETCHAR(str, z - 1) != STB_TEXTEDIT_NEWLINE)  // [DEAR IMGUI] special handling for last line
          break;   // [DEAR IMGUI]
       prev_start = i;
@@ -648,15 +683,33 @@ static void stb_textedit_move_to_last(IMSTB_TEXTEDIT_STRING *str, STB_TexteditSt
    }
 }
 
-// [DEAR IMGUI]
-// Functions must be implemented for UTF8 support
-// Code in this file that uses those functions is modified for [DEAR IMGUI] and deviates from the original stb_textedit.
-// There is not necessarily a '[DEAR IMGUI]' at the usage sites.
-#ifndef IMSTB_TEXTEDIT_GETPREVCHARINDEX
-#define IMSTB_TEXTEDIT_GETPREVCHARINDEX(obj, idx) (idx - 1)
+// [DEAR IMGUI] Extracted this function so we can more easily add support for word-wrapping.
+#ifndef STB_TEXTEDIT_MOVELINESTART
+static int stb_textedit_move_line_start(IMSTB_TEXTEDIT_STRING *str, STB_TexteditState *state, int cursor)
+{
+   if (state->single_line)
+      return 0;
+   while (cursor > 0) {
+      int prev = IMSTB_TEXTEDIT_GETPREVCHARINDEX(str, cursor);
+      if (STB_TEXTEDIT_GETCHAR(str, prev) == STB_TEXTEDIT_NEWLINE)
+         break;
+      cursor = prev;
+   }
+   return cursor;
+}
+#define STB_TEXTEDIT_MOVELINESTART stb_textedit_move_line_start
 #endif
-#ifndef IMSTB_TEXTEDIT_GETNEXTCHARINDEX
-#define IMSTB_TEXTEDIT_GETNEXTCHARINDEX(obj, idx) (idx + 1)
+#ifndef STB_TEXTEDIT_MOVELINEEND
+static int stb_textedit_move_line_end(IMSTB_TEXTEDIT_STRING *str, STB_TexteditState *state, int cursor)
+{
+   int n = STB_TEXTEDIT_STRINGLEN(str);
+   if (state->single_line)
+      return n;
+   while (cursor < n && STB_TEXTEDIT_GETCHAR(str, cursor) != STB_TEXTEDIT_NEWLINE)
+      cursor = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, cursor);
+   return cursor;
+}
+#define STB_TEXTEDIT_MOVELINEEND stb_textedit_move_line_end
 #endif
 
 #ifdef STB_TEXTEDIT_IS_SPACE
@@ -668,9 +721,9 @@ static int is_word_boundary( IMSTB_TEXTEDIT_STRING *str, int idx )
 #ifndef STB_TEXTEDIT_MOVEWORDLEFT
 static int stb_textedit_move_to_word_previous( IMSTB_TEXTEDIT_STRING *str, int c )
 {
-   --c; // always move at least one character
-   while( c >= 0 && !is_word_boundary( str, c ) )
-      --c;
+   c = IMSTB_TEXTEDIT_GETPREVCHARINDEX( str, c ); // always move at least one character
+   while (c >= 0 && !is_word_boundary(str, c))
+      c = IMSTB_TEXTEDIT_GETPREVCHARINDEX(str, c);
 
    if( c < 0 )
       c = 0;
@@ -684,9 +737,9 @@ static int stb_textedit_move_to_word_previous( IMSTB_TEXTEDIT_STRING *str, int c
 static int stb_textedit_move_to_word_next( IMSTB_TEXTEDIT_STRING *str, int c )
 {
    const int len = STB_TEXTEDIT_STRINGLEN(str);
-   ++c; // always move at least one character
+   c = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, c); // always move at least one character
    while( c < len && !is_word_boundary( str, c ) )
-      ++c;
+      c = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, c);
 
    if( c > len )
       c = len;
@@ -725,7 +778,8 @@ static int stb_textedit_paste_internal(IMSTB_TEXTEDIT_STRING *str, STB_TexteditS
    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)) {
+   len = STB_TEXTEDIT_INSERTCHARS(str, state->cursor, text, len);
+   if (len) {
       stb_text_makeundo_insert(state, state->cursor, len);
       state->cursor += len;
       state->has_preferred_x = 0;
@@ -739,6 +793,7 @@ static int stb_textedit_paste_internal(IMSTB_TEXTEDIT_STRING *str, STB_TexteditS
 #define STB_TEXTEDIT_KEYTYPE int
 #endif
 
+// API key: process text input
 // [DEAR IMGUI] Added stb_textedit_text(), extracted out and called by stb_textedit_key() for backward compatibility.
 static void stb_textedit_text(IMSTB_TEXTEDIT_STRING* str, STB_TexteditState* state, const IMSTB_TEXTEDIT_CHARTYPE* text, int text_len)
 {
@@ -749,14 +804,15 @@ static void stb_textedit_text(IMSTB_TEXTEDIT_STRING* str, STB_TexteditState* sta
    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, text, text_len)) {
+      text_len = STB_TEXTEDIT_INSERTCHARS(str, state->cursor, text, text_len);
+      if (text_len) {
          state->cursor += text_len;
          state->has_preferred_x = 0;
       }
-   }
-   else {
+   } else {
       stb_textedit_delete_selection(str, state); // implicitly clamps
-      if (STB_TEXTEDIT_INSERTCHARS(str, state->cursor, text, text_len)) {
+      text_len = STB_TEXTEDIT_INSERTCHARS(str, state->cursor, text, text_len);
+      if (text_len) {
          stb_text_makeundo_insert(state, state->cursor, text_len);
          state->cursor += text_len;
          state->has_preferred_x = 0;
@@ -771,6 +827,7 @@ retry:
    switch (key) {
       default: {
 #ifdef STB_TEXTEDIT_KEYTOTEXT
+         // This is not suitable for UTF-8 support.
          int c = STB_TEXTEDIT_KEYTOTEXT(key);
          if (c > 0) {
             IMSTB_TEXTEDIT_CHARTYPE ch = (IMSTB_TEXTEDIT_CHARTYPE)c;
@@ -911,15 +968,16 @@ retry:
 
             // [DEAR IMGUI]
             // going down while being on the last line shouldn't bring us to that line end
-            if (STB_TEXTEDIT_GETCHAR(str, find.first_char + find.length - 1) != STB_TEXTEDIT_NEWLINE)
-               break;
+            //if (STB_TEXTEDIT_GETCHAR(str, find.first_char + find.length - 1) != STB_TEXTEDIT_NEWLINE)
+            //   break;
 
             // now find character position down a row
             state->cursor = start;
             STB_TEXTEDIT_LAYOUTROW(&row, str, state->cursor);
             x = row.x0;
-            for (i=0; i < row.num_chars; ++i) {
+            for (i=0; i < row.num_chars; ) {
                float dx = STB_TEXTEDIT_GETWIDTH(str, start, i);
+               int next = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state->cursor);
                #ifdef IMSTB_TEXTEDIT_GETWIDTH_NEWLINE
                if (dx == IMSTB_TEXTEDIT_GETWIDTH_NEWLINE)
                   break;
@@ -927,10 +985,13 @@ retry:
                x += dx;
                if (x > goal_x)
                   break;
-               state->cursor = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state->cursor);
+               i += next - state->cursor;
+               state->cursor = next;
             }
             stb_textedit_clamp(str, state);
 
+            if (state->cursor == find.first_char + find.length)
+               str->LastMoveDirectionLR = ImGuiDir_Left;
             state->has_preferred_x = 1;
             state->preferred_x = goal_x;
 
@@ -980,8 +1041,9 @@ retry:
             state->cursor = find.prev_first;
             STB_TEXTEDIT_LAYOUTROW(&row, str, state->cursor);
             x = row.x0;
-            for (i=0; i < row.num_chars; ++i) {
+            for (i=0; i < row.num_chars; ) {
                float dx = STB_TEXTEDIT_GETWIDTH(str, find.prev_first, i);
+               int next = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state->cursor);
                #ifdef IMSTB_TEXTEDIT_GETWIDTH_NEWLINE
                if (dx == IMSTB_TEXTEDIT_GETWIDTH_NEWLINE)
                   break;
@@ -989,10 +1051,15 @@ retry:
                x += dx;
                if (x > goal_x)
                   break;
-               state->cursor = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state->cursor);
+               i += next - state->cursor;
+               state->cursor = next;
             }
             stb_textedit_clamp(str, state);
 
+            if (state->cursor == find.first_char)
+               str->LastMoveDirectionLR = ImGuiDir_Right;
+            else if (state->cursor == find.prev_first)
+               str->LastMoveDirectionLR = ImGuiDir_Left;
             state->has_preferred_x = 1;
             state->preferred_x = goal_x;
 
@@ -1002,10 +1069,15 @@ retry:
             // go to previous line
             // (we need to scan previous line the hard way. maybe we could expose this as a new API function?)
             prev_scan = find.prev_first > 0 ? find.prev_first - 1 : 0;
-            while (prev_scan > 0 && STB_TEXTEDIT_GETCHAR(str, prev_scan - 1) != STB_TEXTEDIT_NEWLINE)
-               --prev_scan;
+            while (prev_scan > 0)
+            {
+               int prev = IMSTB_TEXTEDIT_GETPREVCHARINDEX(str, prev_scan);
+               if (STB_TEXTEDIT_GETCHAR(str, prev) == STB_TEXTEDIT_NEWLINE)
+                  break;
+               prev_scan = prev;
+            }
             find.first_char = find.prev_first;
-            find.prev_first = prev_scan;
+            find.prev_first = STB_TEXTEDIT_MOVELINESTART(str, state, prev_scan);
          }
          break;
       }
@@ -1079,10 +1151,7 @@ retry:
       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->cursor = STB_TEXTEDIT_MOVELINESTART(str, state, state->cursor);
          state->has_preferred_x = 0;
          break;
 
@@ -1090,13 +1159,9 @@ retry:
       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;
+         stb_textedit_move_to_last(str, state);
+         state->cursor = STB_TEXTEDIT_MOVELINEEND(str, state, state->cursor);
          state->has_preferred_x = 0;
          break;
       }
@@ -1107,10 +1172,7 @@ retry:
       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->cursor = STB_TEXTEDIT_MOVELINESTART(str, state, state->cursor);
          state->select_end = state->cursor;
          state->has_preferred_x = 0;
          break;
@@ -1119,13 +1181,9 @@ retry:
       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->cursor = STB_TEXTEDIT_MOVELINEEND(str, state, state->cursor);
          state->select_end = state->cursor;
          state->has_preferred_x = 0;
          break;
@@ -1300,7 +1358,7 @@ static void stb_text_undo(IMSTB_TEXTEDIT_STRING *str, STB_TexteditState *state)
    // 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);
+      u.insert_length = STB_TEXTEDIT_INSERTCHARS(str, u.where, &s->undo_char[u.char_storage], u.insert_length);
       s->undo_char_point -= u.insert_length;
    }
 
@@ -1351,7 +1409,7 @@ static void stb_text_redo(IMSTB_TEXTEDIT_STRING *str, STB_TexteditState *state)
 
    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);
+      r.insert_length = STB_TEXTEDIT_INSERTCHARS(str, r.where, &s->undo_char[r.char_storage], r.insert_length);
       s->redo_char_point += r.insert_length;
    }
 

ext/imgui/imstb_truetype.h

@@ -886,7 +886,7 @@ STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, fl
 // xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
 
 STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
-// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
+// the same as stbtt_GetCodepointBitmap, but you can specify a subpixel
 // shift for the character
 
 STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
@@ -4516,8 +4516,8 @@ static int stbtt__compute_crossings_x(float x, float y, int nverts, stbtt_vertex
             q2[0] = (float)x2;
             q2[1] = (float)y2;
             if (equal(q0,q1) || equal(q1,q2)) {
-               x0 = (int)verts[i-1].x;
-               y0 = (int)verts[i-1].y;
+               x0 = (int)verts[i-1].x; //-V1048
+               y0 = (int)verts[i-1].y; //-V1048
                x1 = (int)verts[i  ].x;
                y1 = (int)verts[i  ].y;
                if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) {