Merge branch 'master' into docking

# Conflicts:
#	backends/imgui_impl_glfw.cpp
#	docs/CHANGELOG.txt
#	imgui.cpp

examples/example_emscripten_wgpu/main.cpp

@@ -127,6 +127,8 @@ static bool InitWGPU()
 
 static void MainLoopStep(void* window)
 {
+    ImGuiIO& io = ImGui::GetIO();
+
     glfwPollEvents();
 
     int width, height;