I'm looking for the above mainly for Thunderbird (which a web search didn't give me much) but would be happy to do with other apps, under GNOME 3.
Any idea if this is even possible?
Hi, there's a gnome extension that is more or less capable of doing this: https://extensions.gnome.org/extension/16/auto-move-windows/
The reason I'm saying "more or less" is that it didn't work here for all kind of windows, in my case kdenlive didn't seem to care. Might be because it's KDE-born, nut sure. But it worked for Thunderbird :)
HTH, Thomas