[1.09] Aborting attack causes a semi-lockup.

This is 100% reproduceable.

Attack something so that you get the selection window for Auto / Tactical battle.

Do not choose one of these options.  Instead, press ESC and leave the options window again.

Now you cannot move.  cannot attack,  cannot end turn.

I called it a semi-lockup because it only locks up the gamestate.
It doesn't lock up the engine so you can save / reload at this point, which fixes the issue.

It's not new with 1.09. It has also happened before that.