prevent clients from positioning out of workspace
prevent clients from positioning out of workspace

Still enough stupid ones around which ask for 0,0
(despite there's a panel ...) or restore a position
on a VGA screen which they stored while being on a 4k
screen.

Otoh, do not forcefully position the window just because
the topleft position is outside any head, this can still
be desired and isn't a problem.
Actually, the corner could be covered by the close button
and if *only* it is onscreen the window can hardly by used
or seen.

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