Rui Matos d87db04e55 panel: Update corners' nearest button on session mode change
With panel buttons changing dynamically on session mode changes we can
no longer rely on a corner's respective box style-changed signal to
find the nearest button.

Instead, make the panel take care of telling the corners to look for a
new button when buttons are changed.

https://bugzilla.gnome.org/show_bug.cgi?id=690180
2013-01-04 13:35:53 +00:00
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