Canceling text input with [esc] key uses stb_textedit facilities to restore original value. This makes restoration undoable using hotkeys.

Fixes #3008.

docs/CHANGELOG.txt

@@ -76,6 +76,7 @@ Other Changes:
   those improvements in 1.73 makes them unnecessary. (#2722, #2770). [@rokups]
 - ColorEdit: "Copy As" context-menu tool shows hex values with a '#' prefix instead of '0x'.
 - ColorEdit: "Copy As" content-menu tool shows hex values both with/without alpha when available.
+- InputText: Fix crash when executing undo action after clearing input with ESC (#3008). [@rokups]
 - MenuBar: Fix minor clipping issue where occasionally a menu text can overlap the right-most border.
 - Window: Fix SetNextWindowBgAlpha(1.0f) failing to override alpha component. (#3007) [@Albog]
 - Window: When testing for the presence of the ImGuiWindowFlags_NoBringToFrontOnFocus flag we

imgui_widgets.cpp

@@ -3828,6 +3828,25 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
             {
                 apply_new_text = state->InitialTextA.Data;
                 apply_new_text_length = state->InitialTextA.Size - 1;
+
+                // Select all text
+                state->OnKeyPressed(STB_TEXTEDIT_K_TEXTSTART);
+                state->OnKeyPressed(STB_TEXTEDIT_K_TEXTEND | STB_TEXTEDIT_K_SHIFT);
+
+                // Paste converted text or empty buffer
+                if (state->InitialTextA.size() > 1)
+                {
+                    ImVector<ImWchar> w_text;
+                    const char* apply_new_text_end = apply_new_text + apply_new_text_length + 1;
+                    w_text.resize(ImTextCountCharsFromUtf8(apply_new_text, apply_new_text_end));
+                    ImTextStrFromUtf8(w_text.Data, w_text.Size, apply_new_text, apply_new_text_end);
+                    ImStb::stb_textedit_paste(state, &state->Stb, w_text.Data, w_text.Size);
+                }
+                else
+                {
+                    ImWchar empty = 0;
+                    ImStb::stb_textedit_paste(state, &state->Stb, &empty, 0);
+                }
             }
         }