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v2: win32u: Use WM_WINE_CLIPCURSOR / TRUE for empty clipping rect.
win32u: Add a separate function to process WM_WINE_CLIPCURSOR.
win32u: Move cursor clipping functions to input.c.
win32u: Move some window functions to window.c.
https://gitlab.winehq.org/wine/wine/-/merge_requests/2936