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libweston-desktop: Store weston_surface in grabs

Derek Foreman requested to merge derekf/weston:grab_after_free into main

If a client disconnects during a popup grab we can have the parent weston_desktop_surface destroyed before the popup, which leads to a use after free when ending the grab.

However, the weston_surface is still around at that time - so we can just store weston_surface in popup_grab instead of the weston_desktop_surface.

Fixes #870 (closed)

Signed-off-by: Derek Foreman derek.foreman@collabora.com

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