Merge branch 'master' into docking

# Conflicts:
#	backends/imgui_impl_dx9.cpp
#	backends/imgui_impl_sdl.cpp
#	backends/imgui_impl_win32.cpp
#	imgui.cpp
#	imgui_internal.h
#	imgui_widgets.cpp

examples/example_win32_directx12/main.cpp

@@ -129,21 +129,24 @@ int main(int, char**)
     ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
 
     // Main loop
-    MSG msg;
-    ZeroMemory(&msg, sizeof(msg));
-    while (msg.message != WM_QUIT)
+    bool done = false;
+    while (!done)
     {
         // Poll and handle messages (inputs, window resize, etc.)
         // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
         // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
         // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
         // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
-        if (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
+        MSG msg;
+        while (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
         {
             ::TranslateMessage(&msg);
             ::DispatchMessage(&msg);
-            continue;
+            if (msg.message == WM_QUIT)
+                done = true;
         }
+        if (done)
+            break;
 
         // Start the Dear ImGui frame
         ImGui_ImplDX12_NewFrame();