Merge branch 'master_fonts' into docking

# Conflicts:
#	backends/imgui_impl_dx10.cpp
#	backends/imgui_impl_dx10.h
#	backends/imgui_impl_dx11.cpp
#	backends/imgui_impl_dx12.cpp
#	backends/imgui_impl_dx9.cpp
#	backends/imgui_impl_glfw.cpp
#	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_sdl3.cpp
#	backends/imgui_impl_sdlgpu3.cpp
#	backends/imgui_impl_sdlgpu3.h
#	backends/imgui_impl_vulkan.cpp
#	examples/example_glfw_opengl3/main.cpp
#	examples/example_sdl2_directx11/main.cpp
#	examples/example_sdl2_opengl2/main.cpp
#	examples/example_sdl2_opengl3/main.cpp
#	examples/example_sdl2_vulkan/main.cpp
#	examples/example_sdl3_opengl3/main.cpp
#	examples/example_sdl3_sdlgpu3/main.cpp
#	examples/example_sdl3_vulkan/main.cpp
#	examples/example_win32_directx10/main.cpp
#	examples/example_win32_directx11/main.cpp
#	examples/example_win32_directx12/main.cpp
#	examples/example_win32_directx9/main.cpp
#	imgui.cpp
#	imgui.h
#	imgui_demo.cpp
#	imgui_internal.h

backends/imgui_impl_sdl2.cpp

@@ -26,6 +26,7 @@
 // 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.
+//  2025-06-11: Added ImGui_ImplSDL2_GetContentScaleForWindow(SDL_Window* window) and ImGui_ImplSDL2_GetContentScaleForDisplay(int display_index) helper to facilitate making DPI-aware apps.
 //  2025-05-15: [Docking] Add Platform_GetWindowFramebufferScale() handler, to allow varying Retina display density on multiple monitors.
 //  2025-04-09: [Docking] Revert update monitors and work areas information every frame. Only do it on Windows. (#8415, #8558)
 //  2025-04-09: Don't attempt to call SDL_CaptureMouse() on drivers where we don't call SDL_GetGlobalMouseState(). (#8561)
@@ -809,6 +810,27 @@ static void ImGui_ImplSDL2_UpdateMouseCursor()
     }
 }
 
+// - On Windows the process needs to be marked DPI-aware!! SDL2 doesn't do it by default. You can call ::SetProcessDPIAware() or call ImGui_ImplWin32_EnableDpiAwareness() from Win32 backend.
+// - Apple platforms use FramebufferScale so we always return 1.0f.
+// - Some accessibility applications are declaring virtual monitors with a DPI of 0.0f, see #7902. We preserve this value for caller to handle.
+float ImGui_ImplSDL2_GetContentScaleForWindow(SDL_Window* window)
+{
+    return ImGui_ImplSDL2_GetContentScaleForDisplay(SDL_GetWindowDisplayIndex(window));
+}
+
+float ImGui_ImplSDL2_GetContentScaleForDisplay(int display_index)
+{
+#if SDL_HAS_PER_MONITOR_DPI
+#ifndef __APPLE__
+    float dpi = 0.0f;
+    if (SDL_GetDisplayDPI(display_index, &dpi, nullptr, nullptr) == 0)
+        return dpi / 96.0f;
+#endif
+#endif
+    IM_UNUSED(display_index);
+    return 1.0f;
+}
+
 static void ImGui_ImplSDL2_CloseGamepads()
 {
     ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();