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Gdk4 Win32: ignore invalid client rects

gwillems requested to merge g.willems/gtk:5724_gdk_win32_ignore_invalid_client_rect into main

Gdk-Win32 uses GetClientRect() internally to query the surfaces coordinates, but this API may fail (by design) in some transient contexts (observed when iconifying a maximized window).

Check if the rect area is null, and don't update the surface position in that case. This will keep the current surface size, until Win32 notifies the new valid window state later.

This prevents using a nulled next_layout for toplevel size computation, which would break widgets allocation once notified on gtk side.

Fixes #5724 (closed)

Closes #5724 (closed)

Edited by gwillems

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