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the robert prince howto
sometimes i'm on slack (ugh) at rubyonrails-link.slack.com or at cloud-native.slack.com, or at sbtechcoop.slack.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.
a nice solution i've found is using yabai, 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.