Merge branch 'master' into docking

# Conflicts:
#	backends/imgui_impl_sdl3.cpp
#	examples/example_sdl3_vulkan/main.cpp

backends/imgui_impl_glfw.cpp

@@ -138,9 +138,6 @@
 #define GLFW_EXPOSE_NATIVE_X11
 #include <X11/Xatom.h>
 #endif
-#ifndef GLFW_EXPOSE_NATIVE_WAYLAND
-#define GLFW_EXPOSE_NATIVE_WAYLAND
-#endif
 #include <GLFW/glfw3native.h>
 #undef Status                   // X11 headers are leaking this.
 #endif

backends/imgui_impl_sdl3.cpp

@@ -24,6 +24,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2025-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2025-10-22: Fixed Platform_OpenInShellFn() return value (unused in core).
 //  2025-09-24: Skip using the SDL_GetGlobalMouseState() state when one of our window is hovered, as the SDL_EVENT_MOUSE_MOTION data is reliable. Fix macOS notch mouse coordinates issue in fullscreen mode + better perf on X11. (#7919, #7786)
 //  2025-09-18: Call platform_io.ClearPlatformHandlers() on shutdown.
 //  2025-09-15: Use SDL_GetWindowDisplayScale() on Mac to output DisplayFrameBufferScale. The function is more reliable during resolution changes e.g. going fullscreen. (#8703, #4414)
@@ -570,7 +571,7 @@ static bool ImGui_ImplSDL3_Init(SDL_Window* window, SDL_Renderer* renderer, void
     platform_io.Platform_SetClipboardTextFn = ImGui_ImplSDL3_SetClipboardText;
     platform_io.Platform_GetClipboardTextFn = ImGui_ImplSDL3_GetClipboardText;
     platform_io.Platform_SetImeDataFn = ImGui_ImplSDL3_PlatformSetImeData;
-    platform_io.Platform_OpenInShellFn = [](ImGuiContext*, const char* url) { return SDL_OpenURL(url) == 0; };
+    platform_io.Platform_OpenInShellFn = [](ImGuiContext*, const char* url) { return SDL_OpenURL(url); };
 
     // Update monitor a first time during init
     ImGui_ImplSDL3_UpdateMonitors();

docs/CHANGELOG.txt

@@ -47,19 +47,38 @@ Other Changes:
   result in temporarily incorrect state, which would lead to bugs to side effects
   in various locations, e.g. GetContentRegionAvail() calls or using clipper. (#9005)
   EndTable() was mistakenly restoring a wrong current table.
+- InputText: when buffer is not resizable, trying to paste contents that
+  cannot fit will now truncate text instead of ignoring the paste. (#9029)
 - InputText: avoid continuously overwriting ownership of ImGuiKey_Enter/_KeypadEnter
   keys in order to allow e.g. external Shortcut override behavior. (#9004)
+- InputText: when using a callback to reduce/manipulate the value of BufTextLen,
+  we do not require anymore that CursorPos be clamped by user code. (#9029)
 - InputTextMultiline: fixed a crash when using ImGuiInputTextFlags_WordWrap and
   resizing the parent window while keeping the multi-line field active (which is
   most typically achieved when resizing programmatically or via a docking layout
   reacting to a platform window resize). (#3237, #9007) [@anton-kl, @ocornut]
-- Backends: Vulkan: added IMGUI_IMPL_VULKAN_VOLK_FILENAME to configure path to
+- MultiSelect: added ImGuiMultiSelectFlags_NoSelectOnRightClick to disable default
-  Volk (default to "volk.h"). (#9008, #7722, #6582, #4854) [@mwlasiuk]
+  right-click processing, which selects item on mouse down and is designed for
-- Backends: WebGPU: update to compile with Dawn and Emscripten's 4.0.10+
+  context-menus. (#8200, #9015)
-  '--use-port=emdawnwebgpu' ports. (#8381, #8898) [@brutpitt, @trbabb]
+- Groups: fixed an issue reporting IsItemEdited() signal after EndGroup() when
-  When using Emscripten 4.0.10+, backend now defaults to IMGUI_IMPL_WEBGPU_BACKEND_DAWN
+  triggered by some widgets e.g. Checkbox(), Selectable() and many others, which
-  instead of IMGUI_IMPL_WEBGPU_BACKEND_WGPU, if neither are specified.
+  cleared ActiveId at the same time as editing. (#9028)
-  (note: examples application were not updated yet)
+  Note that IsItemDeactivatedAfterEdit() was not affected, only IsItemEdited).
+- Backends:
+  - GLFW: fixed building on Linux platforms where Wayland headers
+    are not available. (#9024, #8969, #8921, #8920) [@jagot]
+  - SDL3: fixed Platform_OpenInShellFn() return value (the return value
+    was unused in core but might be used by a direct caller). (#9027) [@achabense]
+  - Vulkan: added IMGUI_IMPL_VULKAN_VOLK_FILENAME to configure path to
+    Volk (default to "volk.h"). (#9008, #7722, #6582, #4854) [@mwlasiuk]
+  - WebGPU: update to compile with Dawn and Emscripten's 4.0.10+
+    '--use-port=emdawnwebgpu' ports. (#8381, #8898) [@brutpitt, @trbabb]
+    When using Emscripten 4.0.10+, backend now defaults to IMGUI_IMPL_WEBGPU_BACKEND_DAWN
+    instead of IMGUI_IMPL_WEBGPU_BACKEND_WGPU, if neither are specified.
+    (note: examples application were not updated yet)
+- Examples:
+  - GLFW+WebGPU: removed unnecessary ImGui_ImplWGPU_InvalidateDeviceObjects() call
+    during surface resize. (#8381)
 
 Docking+Viewports Branch:
 

examples/example_glfw_wgpu/main.cpp

@@ -180,11 +180,7 @@ int main(int, char**)
         int width, height;
         glfwGetFramebufferSize((GLFWwindow*)window, &width, &height);
         if (width != wgpu_surface_width || height != wgpu_surface_height)
-        {
-            ImGui_ImplWGPU_InvalidateDeviceObjects(); // FIXME-OPT: Why doing this? This seems unnecessary and unoptimal.
             ResizeSurface(width, height);
-            ImGui_ImplWGPU_CreateDeviceObjects();
-        }
 
         // Start the Dear ImGui frame
         ImGui_ImplWGPU_NewFrame();

examples/example_sdl2_directx11/main.cpp

@@ -230,6 +230,7 @@ int main(int, char**)
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain
+    // This is a basic setup. Optimally could use e.g. DXGI_SWAP_EFFECT_FLIP_DISCARD and handle fullscreen mode differently. See #8979 for suggestions.
     DXGI_SWAP_CHAIN_DESC sd;
     ZeroMemory(&sd, sizeof(sd));
     sd.BufferCount = 2;

examples/example_sdl3_directx11/main.cpp

@@ -225,6 +225,7 @@ int main(int, char**)
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain
+    // This is a basic setup. Optimally could use e.g. DXGI_SWAP_EFFECT_FLIP_DISCARD and handle fullscreen mode differently. See #8979 for suggestions.
     DXGI_SWAP_CHAIN_DESC sd;
     ZeroMemory(&sd, sizeof(sd));
     sd.BufferCount = 2;

examples/example_sdl3_vulkan/main.cpp

@@ -491,7 +491,7 @@ int main(int, char**)
         if (fb_width > 0 && fb_height > 0 && (g_SwapChainRebuild || g_MainWindowData.Width != fb_width || g_MainWindowData.Height != fb_height))
         {
             ImGui_ImplVulkan_SetMinImageCount(g_MinImageCount);
-            ImGui_ImplVulkanH_CreateOrResizeWindow(g_Instance, g_PhysicalDevice, g_Device, wd, g_QueueFamily, g_Allocator, fb_height, fb_height, g_MinImageCount, 0);
+            ImGui_ImplVulkanH_CreateOrResizeWindow(g_Instance, g_PhysicalDevice, g_Device, wd, g_QueueFamily, g_Allocator, fb_width, fb_height, g_MinImageCount, 0);
             g_MainWindowData.FrameIndex = 0;
             g_SwapChainRebuild = false;
         }

examples/example_win32_directx10/main.cpp

@@ -217,6 +217,7 @@ int main(int, char**)
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain
+    // This is a basic setup. Optimally could use handle fullscreen mode differently. See #8979 for suggestions.
     DXGI_SWAP_CHAIN_DESC sd;
     ZeroMemory(&sd, sizeof(sd));
     sd.BufferCount = 2;

examples/example_win32_directx11/main.cpp

@@ -219,6 +219,7 @@ int main(int, char**)
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain
+    // This is a basic setup. Optimally could use e.g. DXGI_SWAP_EFFECT_FLIP_DISCARD and handle fullscreen mode differently. See #8979 for suggestions.
     DXGI_SWAP_CHAIN_DESC sd;
     ZeroMemory(&sd, sizeof(sd));
     sd.BufferCount = 2;

examples/example_win32_directx12/main.cpp

@@ -332,6 +332,7 @@ int main(int, char**)
 bool CreateDeviceD3D(HWND hWnd)
 {
     // Setup swap chain
+    // This is a basic setup. Optimally could handle fullscreen mode differently. See #8979 for suggestions.
     DXGI_SWAP_CHAIN_DESC1 sd;
     {
         ZeroMemory(&sd, sizeof(sd));
@@ -545,7 +546,7 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
             DXGI_SWAP_CHAIN_DESC1 desc = {};
             g_pSwapChain->GetDesc1(&desc);
             HRESULT result = g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), desc.Format, desc.Flags);
-            assert(SUCCEEDED(result) && "Failed to resize swapchain.");
+            IM_ASSERT(SUCCEEDED(result) && "Failed to resize swapchain.");
             CreateRenderTarget();
         }
         return 0;

imgui.cpp

@@ -12197,6 +12197,7 @@ void ImGui::BeginGroup()
     group_data.BackupActiveIdIsAlive = g.ActiveIdIsAlive;
     group_data.BackupHoveredIdIsAlive = g.HoveredId != 0;
     group_data.BackupIsSameLine = window->DC.IsSameLine;
+    group_data.BackupActiveIdHasBeenEditedThisFrame = g.ActiveIdHasBeenEditedThisFrame;
     group_data.BackupDeactivatedIdIsAlive = g.DeactivatedItemData.IsAlive;
     group_data.EmitItem = true;
 
@@ -12261,7 +12262,7 @@ void ImGui::EndGroup()
         g.LastItemData.StatusFlags |= ImGuiItemStatusFlags_HoveredWindow;
 
     // Forward Edited flag
-    if (group_contains_curr_active_id && g.ActiveIdHasBeenEditedThisFrame)
+    if (g.ActiveIdHasBeenEditedThisFrame && !group_data.BackupActiveIdHasBeenEditedThisFrame)
         g.LastItemData.StatusFlags |= ImGuiItemStatusFlags_Edited;
 
     // Forward Deactivated flag

imgui.h

@@ -29,7 +29,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
 #define IMGUI_VERSION       "1.92.5 WIP"
-#define IMGUI_VERSION_NUM   19241
+#define IMGUI_VERSION_NUM   19242
 #define IMGUI_HAS_TABLE             // Added BeginTable() - from IMGUI_VERSION_NUM >= 18000
 #define IMGUI_HAS_TEXTURES          // Added ImGuiBackendFlags_RendererHasTextures - from IMGUI_VERSION_NUM >= 19198
 #define IMGUI_HAS_VIEWPORT          // In 'docking' WIP branch.
@@ -3132,6 +3132,7 @@ enum ImGuiMultiSelectFlags_
     ImGuiMultiSelectFlags_SelectOnClickRelease  = 1 << 14,  // Apply selection on mouse release when clicking an unselected item. Allow dragging an unselected item without altering selection.
     //ImGuiMultiSelectFlags_RangeSelect2d       = 1 << 15,  // Shift+Selection uses 2d geometry instead of linear sequence, so possible to use Shift+up/down to select vertically in grid. Analogous to what BoxSelect does.
     ImGuiMultiSelectFlags_NavWrapX              = 1 << 16,  // [Temporary] Enable navigation wrapping on X axis. Provided as a convenience because we don't have a design for the general Nav API for this yet. When the more general feature be public we may obsolete this flag in favor of new one.
+    ImGuiMultiSelectFlags_NoSelectOnRightClick  = 1 << 17,  // Disable default right-click processing, which selects item on mouse down, and is designed for context-menus.
 };
 
 // Main IO structure returned by BeginMultiSelect()/EndMultiSelect().
@@ -4144,7 +4145,7 @@ struct ImGuiPlatformIO
     void*       Platform_ClipboardUserData;
 
     // Optional: Open link/folder/file in OS Shell
-    // (default to use ShellExecuteW() on Windows, system() on Linux/Mac)
+    // (default to use ShellExecuteW() on Windows, system() on Linux/Mac. expected to return false on failure, but some platforms may always return true)
     bool        (*Platform_OpenInShellFn)(ImGuiContext* ctx, const char* path);
     void*       Platform_OpenInShellUserData;
 
@@ -4235,8 +4236,8 @@ struct ImGuiPlatformIO
     // Functions
     //------------------------------------------------------------------
 
-    void    ClearPlatformHandlers();    // Clear all Platform_XXX fields. Typically called on Platform Backend shutdown.
+    IMGUI_API void ClearPlatformHandlers();    // Clear all Platform_XXX fields. Typically called on Platform Backend shutdown.
-    void    ClearRendererHandlers();    // Clear all Renderer_XXX fields. Typically called on Renderer Backend shutdown.
+    IMGUI_API void ClearRendererHandlers();    // Clear all Renderer_XXX fields. Typically called on Renderer Backend shutdown.
 };
 
 // (Optional) This is required when enabling multi-viewport. Represent the bounds of each connected monitor/display and their DPI.

imgui_demo.cpp

@@ -2731,6 +2731,10 @@ static void DemoWindowWidgetsSelectionAndMultiSelect(ImGuiDemoWindowData* demo_d
     {
         HelpMarker("Selections can be built using Selectable(), TreeNode() or other widgets. Selection state is owned by application code/data.");
 
+        ImGui::BulletText("Wiki page:");
+        ImGui::SameLine();
+        ImGui::TextLinkOpenURL("imgui/wiki/Multi-Select", "https://github.com/ocornut/imgui/wiki/Multi-Select");
+
         // Without any fancy API: manage single-selection yourself.
         IMGUI_DEMO_MARKER("Widgets/Selection State/Single-Select");
         if (ImGui::TreeNode("Single-Select"))
@@ -3264,6 +3268,7 @@ static void DemoWindowWidgetsSelectionAndMultiSelect(ImGuiDemoWindowData* demo_d
                 ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoAutoSelect", &flags, ImGuiMultiSelectFlags_NoAutoSelect);
                 ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoAutoClear", &flags, ImGuiMultiSelectFlags_NoAutoClear);
                 ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoAutoClearOnReselect", &flags, ImGuiMultiSelectFlags_NoAutoClearOnReselect);
+                ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoSelectOnRightClick", &flags, ImGuiMultiSelectFlags_NoSelectOnRightClick);
                 ImGui::CheckboxFlags("ImGuiMultiSelectFlags_BoxSelect1d", &flags, ImGuiMultiSelectFlags_BoxSelect1d);
                 ImGui::CheckboxFlags("ImGuiMultiSelectFlags_BoxSelect2d", &flags, ImGuiMultiSelectFlags_BoxSelect2d);
                 ImGui::CheckboxFlags("ImGuiMultiSelectFlags_BoxSelectNoScroll", &flags, ImGuiMultiSelectFlags_BoxSelectNoScroll);

imgui_internal.h

@@ -1184,6 +1184,7 @@ struct IMGUI_API ImGuiGroupData
     ImVec2      BackupCurrLineSize;
     float       BackupCurrLineTextBaseOffset;
     ImGuiID     BackupActiveIdIsAlive;
+    bool        BackupActiveIdHasBeenEditedThisFrame;
     bool        BackupDeactivatedIdIsAlive;
     bool        BackupHoveredIdIsAlive;
     bool        BackupIsSameLine;

imgui_widgets.cpp

@@ -4148,21 +4148,23 @@ static void STB_TEXTEDIT_DELETECHARS(ImGuiInputTextState* obj, int pos, int n)
     obj->TextLen -= n;
 }
 
-static bool STB_TEXTEDIT_INSERTCHARS(ImGuiInputTextState* obj, int pos, const char* new_text, int new_text_len)
+static int STB_TEXTEDIT_INSERTCHARS(ImGuiInputTextState* obj, int pos, const char* new_text, int new_text_len)
 {
     const bool is_resizable = (obj->Flags & ImGuiInputTextFlags_CallbackResize) != 0;
     const int text_len = obj->TextLen;
     IM_ASSERT(pos <= text_len);
 
-    if (!is_resizable && (new_text_len + obj->TextLen + 1 > obj->BufCapacity))
+    // We support partial insertion (with a mod in stb_textedit.h)
-        return false;
+    const int avail = obj->BufCapacity - 1 - obj->TextLen;
+    if (!is_resizable && new_text_len > avail)
+        new_text_len = avail; // 0
+    if (new_text_len == 0)
+        return 0;
 
     // Grow internal buffer if needed
     IM_ASSERT(obj->TextSrc == obj->TextA.Data);
-    if (new_text_len + text_len + 1 > obj->TextA.Size)
+    if (text_len + new_text_len + 1 > obj->TextA.Size && is_resizable)
     {
-        if (!is_resizable)
-            return false;
         obj->TextA.resize(text_len + ImClamp(new_text_len, 32, ImMax(256, new_text_len)) + 1);
         obj->TextSrc = obj->TextA.Data;
     }
@@ -4176,7 +4178,7 @@ static bool STB_TEXTEDIT_INSERTCHARS(ImGuiInputTextState* obj, int pos, const ch
     obj->TextLen += new_text_len;
     obj->TextA[obj->TextLen] = '\0';
 
-    return true;
+    return new_text_len;
 }
 
 // We don't use an enum so we can build even with conflicting symbols (if another user of stb_textedit.h leak their STB_TEXTEDIT_K_* symbols)
@@ -4211,7 +4213,8 @@ static void stb_textedit_replace(ImGuiInputTextState* str, STB_TexteditState* st
     state->cursor = state->select_start = state->select_end = 0;
     if (text_len <= 0)
         return;
-    if (ImStb::STB_TEXTEDIT_INSERTCHARS(str, 0, text, text_len))
+    int text_len_inserted = ImStb::STB_TEXTEDIT_INSERTCHARS(str, 0, text, text_len);
+    if (text_len_inserted > 0)
     {
         state->cursor = state->select_start = state->select_end = text_len;
         state->has_preferred_x = 0;
@@ -4306,15 +4309,20 @@ void ImGuiInputTextCallbackData::InsertChars(int pos, const char* new_text, cons
     ImGuiContext& g = *Ctx;
     ImGuiInputTextState* obj = &g.InputTextState;
     IM_ASSERT(obj->ID != 0 && g.ActiveId == obj->ID);
+    const bool is_resizable = (Flags & ImGuiInputTextFlags_CallbackResize) != 0;
+    const bool is_readonly = (Flags & ImGuiInputTextFlags_ReadOnly) != 0;
+    int new_text_len = new_text_end ? (int)(new_text_end - new_text) : (int)ImStrlen(new_text);
+
+    // We support partial insertion (with a mod in stb_textedit.h)
+    const int avail = BufSize - 1 - BufTextLen;
+    if (!is_resizable && new_text_len > avail)
+        new_text_len = avail; // 0
+    if (new_text_len == 0)
+        return;
 
     // Grow internal buffer if needed
-    const bool is_resizable = (Flags & ImGuiInputTextFlags_CallbackResize) != 0;
+    if (new_text_len + BufTextLen + 1 > obj->TextA.Size && is_resizable && !is_readonly)
-    const int new_text_len = new_text_end ? (int)(new_text_end - new_text) : (int)ImStrlen(new_text);
-    if (new_text_len + BufTextLen + 1 > obj->TextA.Size && (Flags & ImGuiInputTextFlags_ReadOnly) == 0)
     {
-        if (!is_resizable)
-            return;
-
         IM_ASSERT(Buf == obj->TextA.Data);
         int new_buf_size = BufTextLen + ImClamp(new_text_len * 4, 32, ImMax(256, new_text_len)) + 1;
         obj->TextA.resize(new_buf_size + 1);
@@ -5268,10 +5276,9 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                     callback_data.BufTextLen = state->TextLen;
                     callback_data.BufSize = state->BufCapacity;
                     callback_data.BufDirty = false;
-
+                    callback_data.CursorPos = state->Stb->cursor;
-                    const int utf8_cursor_pos = callback_data.CursorPos = state->Stb->cursor;
+                    callback_data.SelectionStart = state->Stb->select_start;
-                    const int utf8_selection_start = callback_data.SelectionStart = state->Stb->select_start;
+                    callback_data.SelectionEnd = state->Stb->select_end;
-                    const int utf8_selection_end = callback_data.SelectionEnd = state->Stb->select_end;
 
                     // Call user code
                     callback(&callback_data);
@@ -5281,11 +5288,12 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                     IM_ASSERT(callback_data.Buf == callback_buf);         // Invalid to modify those fields
                     IM_ASSERT(callback_data.BufSize == state->BufCapacity);
                     IM_ASSERT(callback_data.Flags == flags);
-                    const bool buf_dirty = callback_data.BufDirty;
+                    if (callback_data.BufDirty || callback_data.CursorPos != state->Stb->cursor)
-                    if (callback_data.CursorPos != utf8_cursor_pos || buf_dirty)            { state->Stb->cursor = callback_data.CursorPos; state->CursorFollow = true; }
+                        state->CursorFollow = true;
-                    if (callback_data.SelectionStart != utf8_selection_start || buf_dirty)  { state->Stb->select_start = (callback_data.SelectionStart == callback_data.CursorPos) ? state->Stb->cursor : callback_data.SelectionStart; }
+                    state->Stb->cursor = ImClamp(callback_data.CursorPos, 0, callback_data.BufTextLen);
-                    if (callback_data.SelectionEnd != utf8_selection_end || buf_dirty)      { state->Stb->select_end = (callback_data.SelectionEnd == callback_data.SelectionStart) ? state->Stb->select_start : callback_data.SelectionEnd; }
+                    state->Stb->select_start = ImClamp(callback_data.SelectionStart, 0, callback_data.BufTextLen);
-                    if (buf_dirty)
+                    state->Stb->select_end = ImClamp(callback_data.SelectionEnd, 0, callback_data.BufTextLen);
+                    if (callback_data.BufDirty)
                     {
                         // Callback may update buffer and thus set buf_dirty even in read-only mode.
                         IM_ASSERT(callback_data.BufTextLen == (int)ImStrlen(callback_data.Buf)); // You need to maintain BufTextLen if you change the text!
@@ -8219,8 +8227,8 @@ void ImGui::MultiSelectItemFooter(ImGuiID id, bool* p_selected, bool* p_pressed)
         }
 
     // Right-click handling.
-    // FIXME-MULTISELECT: Currently filtered out by ImGuiMultiSelectFlags_NoAutoSelect but maybe should be moved to Selectable(). See https://github.com/ocornut/imgui/pull/5816
+    // FIXME-MULTISELECT: Maybe should be moved to Selectable()? Also see #5816, #8200, #9015
-    if (hovered && IsMouseClicked(1) && (flags & ImGuiMultiSelectFlags_NoAutoSelect) == 0)
+    if (hovered && IsMouseClicked(1) && (flags & (ImGuiMultiSelectFlags_NoAutoSelect | ImGuiMultiSelectFlags_NoSelectOnRightClick)) == 0)
     {
         if (g.ActiveId != 0 && g.ActiveId != id)
             ClearActiveID();

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
@@ -147,7 +149,8 @@
 //                                        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
 //
@@ -775,7 +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;
@@ -800,13 +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 {
       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;
@@ -1352,7 +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;
    }
 
@@ -1403,7 +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;
    }