xwl_present_cleanup frees the struct xwl_present_window memory, so if there's a pending callback, we have to destroy it to prevent use-after-free in xwl_present_sync_callback.
Should fix issue #645 (closed).
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xwl_present_cleanup frees the struct xwl_present_window memory, so if there's a pending callback, we have to destroy it to prevent use-after-free in xwl_present_sync_callback.
Should fix issue #645 (closed).