No keyboard input focus after "move tab to new window"

If, after "move tab to new window", the old window still exists (still has tabs) it is the foreground window (intended?) but the cursor is not shown. And, in that situation, although other keys are not accepted, [Enter] causes the creation of a new tab.

To reproduce, in a situation like this


Move one of the tabs to a new window (observe no apparent keyboard focus) ... press [Enter] (get a new tab).

Start by reproducing the tab move in Windows Terminal when the original window still has tabs, then inspect the focus handling for the resulting foreground window. Done means keyboard focus and the visible cursor are restored, and pressing Enter no longer unexpectedly creates a new tab.

Written by the indexing model from the issue text.