bookmarks: resolve divergent bookmarks when moving active bookmark forward...
bookmarks: resolve divergent bookmarks when moving active bookmark forward
This patch resolves divergent bookmarks between the current active bookmark
MARK and the new destination. This situation can arise when pulling new
changesets, abandoning your current changesets actively bookmarked with MARK
via strip, and then doing a bare update. The non-divergent but active bookmark
MARK is then moved to a common ancestor of the new changesets and the abandoned
changesets.
Test coverage is added.