D3D1x: Disable window changes on all windows.

src/renderer_d3d11.cpp

@@ -4592,6 +4592,15 @@ namespace bgfx { namespace d3d11
 			);
 		BGFX_FATAL(SUCCEEDED(hr), Fatal::UnableToInitialize, "Failed to create swap chain.");
 
+#if BX_PLATFORM_WINDOWS
+		DX_CHECK(s_renderD3D11->m_dxgi.m_factory->MakeWindowAssociation(
+			  (HWND)_nwh
+			, 0
+			| DXGI_MWA_NO_WINDOW_CHANGES
+			| DXGI_MWA_NO_ALT_ENTER
+			) );
+#endif // BX_PLATFORM_WINDOWS
+
 		ID3D11Resource* ptr;
 		DX_CHECK(m_swapChain->GetBuffer(0, IID_ID3D11Texture2D, (void**)&ptr) );
 		DX_CHECK(device->CreateRenderTargetView(ptr, NULL, &m_rtv[0]) );

src/renderer_d3d12.cpp

@@ -4949,13 +4949,20 @@ namespace bgfx { namespace d3d12
 
 		HRESULT hr;
 		hr = s_renderD3D12->m_dxgi.createSwapChain(
-				  s_renderD3D12->getDeviceForSwapChain()
-				, scd
-				, &m_swapChain
-				);
+			  s_renderD3D12->getDeviceForSwapChain()
+			, scd
+			, &m_swapChain
+			);
 		BGFX_FATAL(SUCCEEDED(hr), Fatal::UnableToInitialize, "Failed to create swap chain.");
 		m_state = D3D12_RESOURCE_STATE_PRESENT;
 
+		DX_CHECK(s_renderD3D12->m_dxgi.m_factory->MakeWindowAssociation(
+			  (HWND)_nwh
+			, 0
+			| DXGI_MWA_NO_WINDOW_CHANGES
+			| DXGI_MWA_NO_ALT_ENTER
+			) );
+
 		ID3D12Device* device = s_renderD3D12->m_device;
 		FrameBufferHandle fbh = { uint16_t(this - s_renderD3D12->m_frameBuffers) };