Textures: Fixed support for `#define ImTextureID_Invalid` to non-zero value.

docs/CHANGELOG.txt

diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index fd705f1..3bf28c6 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -43,6 +43,9 @@
 
 Other changes:
 
+- Textures: Fixed support for `#define ImTextureID_Invalid` to non-zero value:
+  ImTextureData() was incorrectly cleared with zeroes. (#8745) [@rachit7645]
+- Demo: Added "Text -> Font Size" demo section. (#8738) [@Demonese]
 - Backends: SDL3: avoid calling SDL_StartTextInput() again if already active.
   (#8727) [@morrazzzz]
 - Backends: OSX: added ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress

imgui.h

diff --git a/imgui.h b/imgui.h
index e417731..b09d7ee 100644
--- a/imgui.h
+++ b/imgui.h
@@ -3440,7 +3440,7 @@
     bool                WantDestroyNextFrame;   // rw   -   // [Internal] Queued to set ImTextureStatus_WantDestroy next frame. May still be used in the current frame.
 
     // Functions
-    ImTextureData()     { memset(this, 0, sizeof(*this)); }
+    ImTextureData()     { memset(this, 0, sizeof(*this)); TexID = ImTextureID_Invalid; }
     ~ImTextureData()    { DestroyPixels(); }
     IMGUI_API void      Create(ImTextureFormat format, int w, int h);
     IMGUI_API void      DestroyPixels();