[dxgi] Update saved window state on ResizeTarget

Author: Matteo Bruni

src/dxgi/dxgi_swapchain.cpp

@@ -491,12 +491,23 @@ namespace dxvk {
         Logger::err("DXGI: ResizeTarget: Failed to query containing output");
         return E_FAIL;
       }
-      
-      ChangeDisplayMode(output.ptr(), &newDisplayMode);
 
+      RECT bounds = { };
+      wsi::getDesktopCoordinates(m_monitor, &bounds);
+
+      uint32_t width = 0u;
+      uint32_t height = 0u;
+
+      wsi::getWindowSize(m_window, &width, &height);
+
+      // Window bounds were changed behind our back, update saved state
+      if (uint32_t(bounds.right - bounds.left) != width || uint32_t(bounds.bottom - bounds.top) != height)
+        wsi::saveWindowState(m_window, &m_windowState, false);
+
+      ChangeDisplayMode(output.ptr(), &newDisplayMode);
       wsi::updateFullscreenWindow(m_monitor, m_window, false);
     }
-    
+
     return S_OK;
   }