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Upstream bug report: https://github.com/tmux/tmux/issues/378 It's fixed in tmux 2.2
Thanks for the bugreport. I've built tmux 2.2 for F23 - you can find it here: http://koji.fedoraproject.org/koji/taskinfo?taskID=13785122 I am not going to update f23 to 2.2 officially until F24 has been out for a few eeks (f24 is going to have 2.2 by default). Please use the koji build in the meantime.
Confirmed, the koji build fixes the issue, thank you!
2.2 is out on f24+ now