4 ms·

What do you mean? I have been using focus-follows-mouse since the late 1990s and have never noticed a program that was incompatible with it.

• jhallenworld 4y ago
  It's usually some commercial programs that have issues.. I was going to try it and give a more specific answer, but Ubuntu does not let me run twm. I get a blank screen when I log in with twm selected.
  • dsr_ 4y ago
    You very likely have twm running and no other programs. Clicking on the empty desktop ought to get you a menu.
    • jhallenworld 4y ago
      So this is what's happening, but it's still messed up. The menus appear, but don't disappear, so pretty soon I have 20 menus all over the screen. Also no mouse pointer until I click. Also, the menu entries don't do anything (yes, I'm holding until the entry is selected, then releasing). Anyway I tried it in vnc4server, where it does work, though you have to start it with LANG=C. But now I can't find any programs that are not working.. I'll have to use it for a while.