2.3.x versions have had multiple documents GUI
enabled for some time. Problem is one can end up
having lots of windows open. And since we show
caption in window title, if paths are long there is no
difference in texts shown in Window-menu. Impossible
to select correct window.
I'd suggest we have dialog opened from Window-menu
which lists currently open windows. List should be
ordered so it shows file compare windows attached to
correct directory compare window. So one can see
which file compare windows are belong to which
directory compare window.