The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/portage-stable/+/dce2bb0746e68134a7b214f45992ecab149a0d40

commit dce2bb0746e68134a7b214f45992ecab149a0d40
Author: Raul E Rangel <rrangel@chromium.org>
Date: Fri May 04 10:02:12 2018

tmux: upgraded package to upstream

Upgraded app-misc/tmux to version 2.6 on amd64 from 1.9

See changelog: https://github.com/tmux/tmux/blob/master/CHANGES

BUG= chromium:838928 
TEST=emerge tmux && emerge-grunt tmux && emerge-bob tmux
Tried tmux on both host and grunt and had no issues.

Change-Id: I0ee53245c23a9d617478f465a4506c3f2cffdf5a
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1039774
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Benjamin Gordon <bmgordon@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[delete] https://crrev.com/e929c817da8d56593a9353ec364188ddcb096fed/metadata/md5-cache/app-misc/tmux-1.9a
[modify] https://crrev.com/dce2bb0746e68134a7b214f45992ecab149a0d40/app-misc/tmux/metadata.xml
[modify] https://crrev.com/dce2bb0746e68134a7b214f45992ecab149a0d40/app-misc/tmux/Manifest
[delete] https://crrev.com/e929c817da8d56593a9353ec364188ddcb096fed/app-misc/tmux/files/tmux-1.9a-flags.patch
[add] https://crrev.com/dce2bb0746e68134a7b214f45992ecab149a0d40/app-misc/tmux/files/tmux-2.4-flags.patch
[add] https://crrev.com/dce2bb0746e68134a7b214f45992ecab149a0d40/metadata/md5-cache/app-misc/tmux-2.6
[delete] https://crrev.com/e929c817da8d56593a9353ec364188ddcb096fed/app-misc/tmux/files/tmux.vim
[add] https://crrev.com/dce2bb0746e68134a7b214f45992ecab149a0d40/app-misc/tmux/tmux-2.6.ebuild
[delete] https://crrev.com/e929c817da8d56593a9353ec364188ddcb096fed/app-misc/tmux/tmux-1.9a.ebuild