Marco Trevisan (Treviño) b476e851b7 workspaceThumbnail: only update _porthole if the overview is visible
Otherwise it happens that porthole is computed again after that the
overlay is hidden (triggered by a layout reallocation) and thus not
regenerated again afterwards.

https://bugzilla.gnome.org/show_bug.cgi?id=792687


(cherry picked from commit 5fcf40b973286fd442148ee3348becd493c8206d)
2018-04-18 00:35:42 +00:00
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