Improvement on group shortcut ergonomics

[nanborges]

Is your feature request related to a problem? Please describe.
The problem is purely ergonomic. Currently the shortcut flow for creating a group with 2 terminals, which has no group, is: Shift+Click on first group button to create group, Enter to confirm, Ctrl+Click on second group button.

Describe the solution you'd like
For QOL, automatically create a group for both groups on Ctrl+Click, when neither terminals are assigned to a group at the moment. The user will not be prompted for confirmation of the group name: the Shift+Click shortcut can be used if this is the user's goal. This way the user can very quickly create broadcasts without barely any effort.

Other goal, a bit more complicated, would be to add an undo history for the group addition actions. This way the operations can be undone, such that the user can quickly broadcast to some terminals, then go back to the previous configuration.

[ ] Feature 1: Ctrl+Click automatically creates groups when needed (currently in progress)
[ ] Feature 2: Undo history for groups

The second feature can be quite complex, so it's up for debate whether to proceed with it.

[mattrose]

@nanborges were you working on your own PR for this issue?

[nanborges]

Hi @mattrose . The user @nicbn is my co-worker, he send the idea of enhancement on his PR.

[mattrose]

Awesome I'll just merge his PR then