I experience this bug under Wayland in Pop!_OS 21.04, which uses a custom fork of Dash to Dock (Cosmic Dock).[*]
I found a clunky workaround: * Select File -> Send Later (ctl-shift-enter): message is saved to Outbox. * Select File -> Send Unsent Messages. This method does not create a "ghost window". But it's nearly as annoying as the bug itself. I had to remove the "Send" button from the Composition toolbar to keep me from reflexively clicking it. (I should really just switch TB to run under Xwayland, but I'm pigheaded.) [*] https://github.com/pop-os/cosmic-dock -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell-extension-ubuntu-dock in Ubuntu. https://bugs.launchpad.net/bugs/1932328 Title: Thunderbird under Wayland does not correctly close (or manage) windows Status in Mozilla Thunderbird: New Status in gnome-shell-extension-ubuntu-dock package in Ubuntu: Confirmed Status in thunderbird package in Ubuntu: Confirmed Bug description: Using Ubuntu 21.04 (Hirsute) that starts in Wayland, by default. Thunderbird version: 78.11.0 with "gnome-support" package. Same problem in safe mode. Description: By default in this context, TB is a Wayland task. When opening a compose windows (or reply or transfer), sending mail apparently close the windows, but gnome shell continue to show multiple "points", as if multiple windows are still active. And after closing TB, it seems maintained in the same state, so it becomes impossible to relaunch it from the desk. But task manager of "looking glass" does not show it and it is possible to launch from terminal. Provisional solution: Modify .desktop file to launch with --display=:0 option, that force to use XWayland interface, as shown by xlsclients (for example). But it is actually a bug under Wayland context, that also badly interfer with many add-ons or extensions. To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1932328/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

