This fixes window size being broken when dragged over multiple monitors with different scales and adds support for padded fullscreen windows when physical display mode aspect ratio doesn't match the emulated one.
-- v2: winex11: Update the Win32 window state outside of event handlers. user32/tests: Workaround a FVWM maximized window state bug. winex11: Delay window config request when restoring from fullscreen/maximized. winex11: Avoid sending WM_WINDOWPOSCHANGING when applying window manager config. winex11: Generate GravityNotify events instead of ConfigureNotify. winex11: Introduce a new get_window_state_updates helper.