Merge branch 'master' into docking

# Conflicts:
#	backends/imgui_impl_allegro5.cpp
#	backends/imgui_impl_allegro5.h
#	backends/imgui_impl_android.cpp
#	backends/imgui_impl_android.h
#	backends/imgui_impl_dx10.cpp
#	backends/imgui_impl_dx10.h
#	backends/imgui_impl_dx12.cpp
#	backends/imgui_impl_dx9.cpp
#	backends/imgui_impl_dx9.h
#	backends/imgui_impl_glfw.cpp
#	backends/imgui_impl_glfw.h
#	backends/imgui_impl_metal.h
#	backends/imgui_impl_metal.mm
#	backends/imgui_impl_opengl2.cpp
#	backends/imgui_impl_opengl2.h
#	backends/imgui_impl_opengl3.cpp
#	backends/imgui_impl_opengl3.h
#	backends/imgui_impl_sdl2.cpp
#	backends/imgui_impl_sdl2.h
#	backends/imgui_impl_sdl3.cpp
#	backends/imgui_impl_sdl3.h
#	backends/imgui_impl_vulkan.cpp
#	backends/imgui_impl_vulkan.h
#	backends/imgui_impl_win32.cpp
#	backends/imgui_impl_win32.h
#	imgui.cpp

backends/imgui_impl_sdlrenderer3.cpp

@@ -11,7 +11,7 @@
 
 // Implemented features:
 //  [X] Renderer: User texture binding. Use 'SDL_Texture*' as ImTextureID. Read the FAQ about ImTextureID!
-//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+//  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
 //  [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
 // Missing features:
 //  [ ] Renderer: Multi-viewport support (multiple windows).
@@ -229,7 +229,7 @@ void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer*
             }
         }
     }
-    platform_io.Renderer_RenderState = NULL;
+    platform_io.Renderer_RenderState = nullptr;
 
     // Restore modified SDL_Renderer state
     SDL_SetRenderViewport(renderer, old.ViewportEnabled ? &old.Viewport : nullptr);