grabs/moving: cleanup drag in tiling layer if window doesn't exist #1528
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It looks like #1475 isn't happening after this, but I need to test a bit more since it's a little hard to reproduce consistently.
This is also meant to fix an issue that can be seen by closing a window (for instance
exit
in cosmic-term, or super+q) while dragging it still leaving a placeholder in the tiling layout. I'm still not entirely sure why that wasn't causing a crash, but dbeaver was.This may not be exactly the right way to fix this. I've also noticed an issue where if an output doesn't have any windows, a placeholder isn't created when dragging a window to that output.