subtree(3p/exwm): update & hard reset to commit 'a6e66f5e33' r/7478

This contains a bunch of upstream changes after the new maintainers of
EXWM took over, including proper mainlined versions of patches I've
been carrying around here manually.

Notably this undoes the Chromium focus fix patch, lets see how that goes.

git-subtree-dir: third_party/exwm
git-subtree-mainline: a756b46bc70a8a1dbb205d50283a3fe65282ed91
git-subtree-split: a6e66f5e339473105d83dd4e7e3f3db9b1aa9f0f
Change-Id: Ibcaba379b56611b8f1918c3b60469492d64a3eb7

0 files changed, 0 insertions, 0 deletions