Merge branch 'master' into docking

# Conflicts:
#	backends/imgui_impl_dx10.cpp
#	backends/imgui_impl_dx11.cpp
#	backends/imgui_impl_dx12.cpp
#	backends/imgui_impl_dx9.cpp
#	backends/imgui_impl_opengl3.cpp
#	backends/imgui_impl_win32.cpp
#	docs/CHANGELOG.txt
#	examples/example_glfw_vulkan/main.cpp
#	examples/example_sdl_vulkan/main.cpp
#	imgui.cpp

examples/example_win32_directx10/main.cpp

@@ -154,8 +154,9 @@ int main(int, char**)
 
         // Rendering
         ImGui::Render();
+        const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
         g_pd3dDevice->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
-        g_pd3dDevice->ClearRenderTargetView(g_mainRenderTargetView, (float*)&clear_color);
+        g_pd3dDevice->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX10_RenderDrawData(ImGui::GetDrawData());
 
         // Update and Render additional Platform Windows