Fix fullscreen window shrinking upon getting restored to a normal window (#1172)

CHANGELOG.md

@@ -12,6 +12,7 @@
 - On Windows, fix handling of surrogate pairs when dispatching `ReceivedCharacter`.
 - On macOS 10.15, fix freeze upon exiting exclusive fullscreen mode.
 - On iOS, fix null window on initial `HiDpiFactorChanged` event.
+- On Windows, fix fullscreen window shrinking upon getting restored to a normal window.
 - On macOS, fix events not being emitted during modal loops, such as when windows are being resized
   by the user.
 - On Windows, fix hovering the mouse over the active window creating an endless stream of CursorMoved events.

src/platform_impl/windows/window.rs

@@ -599,6 +599,7 @@ impl Window {
                     {
                         window_state_lock.dpi_factor = dpi_factor;
                         drop(window_state_lock);
+                        let client_rect = util::adjust_window_rect(window.0, client_rect).unwrap();
 
                         unsafe {
                             winuser::SetWindowPos(