79c020fdb9
Commit 08690d658f42 generalized the banner-blocking behavior of the dateMenu to all menus that would obscure the banner. However setting up the 'open-state-changed' handler only when an indicator is added does not work for indicators that change their entire menu (like the app menu) - we currently end up with menus with no connected signal handler, and throw an error when trying to disconnect an invalid signal ID. To address this, add a new PanelButton::menu-set signal and use that to set up the 'open-state-changed' handler. https://bugzilla.gnome.org/show_bug.cgi?id=745910
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