Fix change stuck in SUBMITTED state but actually merged
This behavior is caused by submitting a commit that has a tag.
Method MergeUtil.markCleanMerges is used by each merge strategy
to update the status of a change if it was a clean merge. It skips
commits that are identified as accepted and their entire ancestry
chain. If a commit is tagged, method MergeOp.getAlreadyAccepted
identifies it as accepted (even if it is not merged yet).
Fix prevents a commit that is referred by a tag to be included in
alreadyAccepted set. If such commit is already merged then it will
be covered anyway by adding heads to alreadyAccepted.
Add a corresponding test that pushes a commit with a tag
Bug: Issue 600
Change-Id: If00247b809b985eaf60ef5ef09fad0f475fb06b9
(cherry picked from commit b22ee233f1ef880cd84beb5939e332de1d7d704e)
4 files changed
