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Re:Show HN: Alacritty, a GPU-accelerated terminal emulator w... by ehsanu1 on Friday January 06, 2017 @07:21PM (#13341568)
Are y'all on Linux/xterm or something? I've had trouble getting this to work in OSX with the default terminal. At one point I got it to partially work by installing some scary looking plugins, but it broke other mouse behavior for me (copy/paste I think).
Re:Show HN: Alacritty, a GPU-accelerated terminal emulator w... by bezhermoso on Saturday January 07, 2017 @05:26PM (#13347022)
I'm on OSX and mouse-support. vim bindings, clipboard, and extended scrollback in tmux "Just Works™" in both Terminal.app and iTerm2. The only external software that I had to install separately is reattach-to-user-namespace to get the clipboard working.

The only problem I encountered was really bad kernel panics when the tmux server exits (i.e. last session is closed), but it has been fixed as of tmux 2.1 as far as I can tell.

I'd say give it another try; the problems you were having might no longer be an issue now.