*** This bug is a duplicate of bug 1932328 ***
    https://bugs.launchpad.net/bugs/1932328

Exactly same problem as bug #1932328.
See discussion and provisional solution.

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https://bugs.launchpad.net/bugs/1938832

Title:
  After sending a message, 2 red dots stay on Ubuntu dock and clicking
  on Thunderbird icon freezes everything

Status in Dash to dock:
  Unknown
Status in gnome-shell-extension-ubuntu-dock package in Ubuntu:
  Confirmed
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  Since a few weeks, I have a problem with Thunderbird (current version
  78.12) and Ubuntu Dock / Dash to Dock in Ubuntu 21.10 :

  When I write a new message and send it, after the message window has
  closed, its red dot remains near Thunderbird button on the Ubuntu dock
  - there are 2 dots: the one of main TB window (receipt box) and a
  second one as if there was another window still opened.

  But if I switch to another application - Firefox, Gedit, Nautilus, no
  matter… - and then with the mouse (left button) click on Thunderbird
  icon, desktop freezes completely, I have to manually close the
  computer and restart it.

  All is frozen, mouse nor Alt-Tab don't work, but if for example
  Radiotray was active, I can still hear the audio program live.

  If I just roll the middle button on the mouse to switch on Thunderbird
  and not click, it doesn't freeze. If I open a window for a new
  message, don't send it and just close it, only one red dot stays and
  no freeze, even with a left button click.

  I also report the bug upstream.

  Crash logs :

  
  Jul  2 18:41:14 valeryan24-desktop gnome-shell[2311]: Object St.Bin 
(0x55c216acf060), has been already deallocated — impossible to set any property 
on it. This might be caused by the object having been destroyed from C code 
using something such as destroy(), dispose(), or remove() vfuncs.
  Jul  2 18:41:14 valeryan24-desktop gnome-shell[2311]: == Stack trace for 
context 0x55c213c2c1d0 ==
  Jul  2 18:41:14 valeryan24-desktop gnome-shell[2311]: #0   7ffe8ca71020 b   
/home/valeryan24/.local/share/gnome-shell/extensions/dash-to-d...@micxgx.gmail.com/docking.js:2036
 (4f2dda5e470 @ 208)
  Jul  2 18:41:14 valeryan24-desktop gnome-shell[2311]: Object St.Bin 
(0x55c216acf060), has been already deallocated — impossible to set any property 
on it. This might be caused by the object having been destroyed from C code 
using something such as destroy(), dispose(), or remove() vfuncs.
  Jul  2 18:41:14 valeryan24-desktop gnome-shell[2311]: == Stack trace for 
context 0x55c213c2c1d0 ==

  Jul  9 00:00:10 valeryan24-desktop gnome-shell[2445]: Object St.Bin 
(0x55abc2039d10), has been already deallocated — impossible to set any property 
on it. This might be caused by the object having been destroyed from C code 
using something such as destroy(), dispose(), or remove() vfuncs.
  Jul  9 00:00:10 valeryan24-desktop gnome-shell[2445]: == Stack trace for 
context 0x55abc1b471d0 ==
  Jul  9 00:00:10 valeryan24-desktop gnome-shell[2445]: #0   7ffc34c41bd0 b   
/home/valeryan24/.local/share/gnome-shell/extensions/dash-to-d...@micxgx.gmail.com/docking.js:2036
 (329752c5e470 @ 208)
  Jul  9 00:00:10 valeryan24-desktop gnome-shell[2445]: Object St.Bin 
(0x55abc2039d10), has been already deallocated — impossible to set any property 
on it. This might be caused by the object having been destroyed from C code 
using something such as destroy(), dispose(), or remove() vfuncs.
  Jul  9 00:00:10 valeryan24-desktop gnome-shell[2445]: == Stack trace for 
context 0x55abc1b471d0 ==

  Jul 16 10:17:15 valeryan24-desktop systemd[2161]: 
app-gnome-firefox-6287.scope: Deactivated successfully.
  
\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00Jul

  Thanks for your help !

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