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 5fcf40b973
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@ -1168,7 +1168,7 @@ var ThumbnailsBox = new Lang.Class({
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// The "porthole" is the portion of the screen that we show in the
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// workspaces
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_ensurePorthole() {
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if (!Main.layoutManager.primaryMonitor)
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if (!Main.layoutManager.primaryMonitor || !Main.overview.visible)
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return false;
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if (!this._porthole)
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