[Merge] indicator-applet:crash-fix into indicator-applet:master

[Alberts Muktupāvels]

Alberts Muktupāvels has proposed merging indicator-applet:crash-fix into indicator-applet:master.

Commit message:
Avoid destroying submenu that we don't own.

Requested reviews:
  Indicator Applet Developers (indicator-applet-developers)

For more details, see:
https://code.launchpad.net/~indicator-applet-developers/indicator-applet/+git/indicator-applet/+merge/474521

applet: unset submenu before destroying menu item
    
GTK will destroy submenu when menu item is destroyed. We don't own submenu wich means that we should not destroy it!
    
https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/2000738
https://gitlab.gnome.org/GNOME/gnome-panel/-/issues/46

-- 
Your team Indicator Applet Developers is requested to review the proposed merge of indicator-applet:crash-fix into indicator-applet:master.
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