Focus-follows-mouse in Gnome-shell?

[Bill Nottingham]

Tom Horsley (horsley1953 at gmail.com) said: 
> > Afaik it's not exposed in the tweak tool UI. Just set the key
> > "/apps/metacity/general/focus_mode" to either "sloppy" or "mouse" (there
> > used to be a difference between these two but I don't see it anymore in
> > 2.34).
> 
> This certainly confuses me. I thought the new window manager
> was mutter, so why does setting keys for metacity have
> an effect? (It does indeed work, mind you, I just don't
> know why).

They share a good deal of code, so they share configuration keys. Also,
it better allows for sharing of settings like this between the normal mode
(which uses mutter) and the fallback mode (that uses metacity.)

Bill