This CL changes the way `git cl split` generates branch names during
upload. Specifically, it attempts to derive a common directory for all
the files in each CL, and includes that dirname as part of the branch
name, in addition to a hash of the files in the CL. This makes it a bit
easier to guess what's in a branch, given its name.
Since the hash is still included, branch names should remain unique.
Finding a common directory should be deterministic, so we can still rely
on branches having the same name if the script is re-run with the same
splitting.
Bug: 389069356
Change-Id: I70490258755f13962f3db5c835619caa24176af9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6243377
Commit-Queue: Devon Loehr <dloehr@google.com>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
