e86c821878
Previously, every time _updateState was called, it would make some change, and so it was necessary to very carefully set up all the calls to it, to ensure it was always called at exactly the right time. Now, instead, we keep a bunch of state variables like "_notificationState" and "_pointerInSummary", and potentially multiple timeouts, and _updateState looks at all of them and figure out what, if anything, needs to be changed. By making the rules about what causes changes more explicit, it will be easier to change those rules in the future as we add new functionality. Also, update the rules a bit, so that notifications can appear while the summary is visible, and the summary only shows after a notification if the summary has changed. https://bugzilla.gnome.org/show_bug.cgi?id=609765
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