Fixes the segfault in the glist_grab_exclusive_focus_and_shift
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Fixes the segfault identified by the 'make check' regression test in the glist_grab_exclusive_focus_and_shift merge request
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Checked 'make check' scripts and they all passed on Linux with gdb addition to the Makefile script to ensure there are no stray issues.
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Arguably a less invasive alternative to the !585 (merged)