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The Robert Prince HOWTO
sometimes i'm on irc at eyearesee dot angrybeatnik dot com
X Windows window managers have had
some flavor of focus follows mouse
(usually including autoraise) forever.
Like, at least since I started using them, in 1994 (my first Linux install was Slackware from Walnut Creek CDROM).
One of the usability flaws of OS X (now macOS) is the lack of focus follows mouse (I know, Terminal.app has focus
follows mouse, but only for Terminal.app windows, and there's no autoraise).
A nice solution I've found is using chunkwm, a tiling window manager for macOS, in float mode.
It gives you
focus follows mouse and autoraise. It's awesome. And of course you can install it with Homebrew.