I have ten virtual desktops of which one is used for thunderbird. If I move to that desktop using the keyboard and open
a new mail window using the keyboard the underlying main window receives the focus. If I close the new mail window via
keyboard and directly open a new one via keyboard it receives the focus as expected.
Also if I have sent a mail and open a second new mail window it directly
receives the focus.
So the problem only seems to occur if I switch to a different virtual desktop and open a new window via keyboard
shortcut on that desktop.
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