Clients pushing to create a new change might be behind the current
branch head and cannot find a suitable common ancestor when relying
only on the refs/heads that get advertised. Scan through some of the
project's open changes and recent history and include those as
potential candidates, so clients have a good chance at finding a
reasonable merge base.
Change-Id: Ifd869dcaa2e46d0fa6996e47c8e00cdc251ccc57
Signed-off-by: Shawn O. Pearce <sop@google.com>
26fa03356a