"focus-follows-mouse" also between windows

[edrozenberg]

Currently focus-follows-mouse only works for focusing different splits within a single window/tab.

ghostty.org/docs/config/reference#focus-follows-mouse

For some use-cases it would be nice to be able to set focus-follows-mouse to also work between Ghostty windows, for ex. a window on the left and a window on the right.

Maybe something like:
focus-follows-mouse = < splits | windows | all | false >

There are some Mac utilities that might enable window-based focus follow for all apps, but I'd want to enable it specifically for Ghostty.

For reference, Mac's Terminal.app currently provides window-based focus follow:
defaults write com.apple.Terminal FocusFollowsMouse -bool YES

My Q is specifically about Mac but may apply to Linux also. I'm aware Linux has long had the option to enable global focus follows mouse between windows. I don't know if it's possible to control this at the app level on Linux, not educated well enough on this topic on Linux OS's.

[00-kat]

Re Linux: I doubt it's possible to do so on Wayland, but I'm not sure about X11.

[mitchellh]

I like this. #5423