Comment 0 for bug 1898477

[Impact]

In Focal the indicator-applet (12.10.2+20.04.20200409-0ubuntu1) contains a bug that can cause duplicate icons to appear in the applet. When an application which creates a notification item is closed, then the indicator applet will just hide its item and not remove it. If the application is started again, a new item will be added to the applet, but the old item is still present (just hidden). When the panel is moved or otherwise refreshed, then all items will be made visible again, causing many duplicates.

The required fix is included in https://bazaar.launchpad.net/~indicator-applet-developers/indicator-applet/trunk.14.04/revision/451 and needs to be back ported into the new SRU release.

For more details see this merge request:
https://code.launchpad.net/~lanoxx/indicator-applet/fix-duplicate-icons/+merge/390344

[Test Case]

 1. Open an application which adds a notification item to the indicator applet. Examples for such an applications are VLC, Network Manager Applet, or Skype.
 2. Close the application and reopen it.
 3. Hold Alt key, then move the panel which has the indicator applet to an different edge of the screen.
 4. Observe that new two icons of the respective application are visible (e.g. to VLC icons).

[Regression Potential]

 * The regression potential is minimal. The only user of this package are the GNOME Flashback packages. The biggest impact this change could have is that indicator applet items behave incorrectly, which is not worse than the current situation.
 * I have tested this patch for several weeks now and not found any regressions.