Added IMGUI_DISABLE_STB_SPRINTF_IMPLEMENTATION config macro to disable stb_sprintf implementation (#6626)

docs/CHANGELOG.txt

@@ -83,6 +83,8 @@ Other changes:
 - IO: Changed io.ClearInputsKeys() specs to also clear current frame character buffer
   (what now obsoleted io.ClearInputCharacters() did), as this is effectively the
   desirable behavior.
+- Misc: Added IMGUI_DISABLE_STB_SPRINTF_IMPLEMENTATION config macro to disable
+  stb_sprintf implementation when using IMGUI_USE_STB_SPRINTF. (#6626) [@septag]
 - Demo: Better showcase use of SetNextItemAllowOverlap(). (#6574, #6512, #3909, #517)
 - Demo: Showcase a few more InputText() flags.
 - Backends: Made all backends sources files support global IMGUI_DISABLE. (#6601)

imconfig.h

@@ -62,9 +62,10 @@
 // By default the embedded implementations are declared static and not available outside of Dear ImGui sources files.
 //#define IMGUI_STB_TRUETYPE_FILENAME   "my_folder/stb_truetype.h"
 //#define IMGUI_STB_RECT_PACK_FILENAME  "my_folder/stb_rect_pack.h"
-//#define IMGUI_STB_SPRINTF_FILENAME    "my_folder/stb_sprintf.h"    // only used if enabled
+//#define IMGUI_STB_SPRINTF_FILENAME    "my_folder/stb_sprintf.h"    // only used if IMGUI_USE_STB_SPRINTF is defined.
 //#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
 //#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_SPRINTF_IMPLEMENTATION                   // only disabled if IMGUI_USE_STB_SPRINTF is defined.
 
 //---- Use stb_sprintf.h for a faster implementation of vsnprintf instead of the one from libc (unless IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS is defined)
 // Compatibility checks of arguments and formats done by clang and GCC will be disabled in order to support the extra formats provided by stb_sprintf.h.

imgui.cpp

@@ -1858,13 +1858,15 @@ const char* ImStrSkipBlank(const char* str)
 // and setup the wrapper yourself. (FIXME-OPT: Some of our high-level operations such as ImGuiTextBuffer::appendfv() are
 // designed using two-passes worst case, which probably could be improved using the stbsp_vsprintfcb() function.)
 #ifdef IMGUI_USE_STB_SPRINTF
+#ifndef IMGUI_DISABLE_STB_SPRINTF_IMPLEMENTATION
 #define STB_SPRINTF_IMPLEMENTATION
+#endif
 #ifdef IMGUI_STB_SPRINTF_FILENAME
 #include IMGUI_STB_SPRINTF_FILENAME
 #else
 #include "stb_sprintf.h"
 #endif
-#endif
+#endif // #ifdef IMGUI_USE_STB_SPRINTF
 
 #if defined(_MSC_VER) && !defined(vsnprintf)
 #define vsnprintf _vsnprintf