Moving tabs between sessions.

[Dra9o]

Please add the ability to move tabs between sessions. Right now, the only option to merge sessions (or move one tab) is to load the session and tab and save them manually. Very tiring. The ideal option, of course, is drag and drop, but the context menu will also be useful ...

[AnFlare]

Same as #585 Anyways, I'm joining these requests. Drag'n'drop-ing tabs between sessions would be awesome.

[Dimoks]

Need to move tabs in/between the windows of a session.

[jmangel]

Allowing drag-and-drop to move windows between sessions would also be greatly appreciated