rebase: use bookmarks.recordchange instead of bookmarks.write

Before this patch we were using the old api bookmarks.write instead of
bookmarks.recordchange at the end of rebase operations.
We move clearstatus within the transaction to make it easier for extensions
that wrap transactions operations.

hgext/rebase.py

@@ -555,14 +555,19 b' def rebase(ui, repo, **opts):'
                 collapsedas = newnode
             clearrebased(ui, repo, state, skipped, collapsedas)
 
-        if True:
+        tr = None
+        try:
+            tr = repo.transaction('bookmark')
             if currentbookmarks:
-                updatebookmarks(repo, targetnode, nstate, currentbookmarks)
+                updatebookmarks(repo, targetnode, nstate, currentbookmarks, tr)
                 if activebookmark not in repo._bookmarks:
                     # active bookmark was divergent one and has been deleted
                     activebookmark = None
+            clearstatus(repo)
+            tr.close()
+        finally:
+            release(tr)
 
-        clearstatus(repo)
         ui.note(_("rebase completed\n"))
         util.unlinkpath(repo.sjoin('undo'), ignoremissing=True)
         if skipped:
@@ -817,7 +822,7 b' def updatemq(repo, state, skipped, **opt'
         mq.seriesdirty = True
         mq.savedirty()
 
-def updatebookmarks(repo, targetnode, nstate, originalbookmarks):
+def updatebookmarks(repo, targetnode, nstate, originalbookmarks, tr):
     'Move bookmarks to their correct changesets, and delete divergent ones'
     marks = repo._bookmarks
     for k, v in originalbookmarks.iteritems():
@@ -825,8 +830,7 b' def updatebookmarks(repo, targetnode, ns'
             # update the bookmarks for revs that have moved
             marks[k] = nstate[v]
             bookmarks.deletedivergent(repo, [targetnode], k)
-
-    marks.write()
+    marks.recordchange(tr)
 
 def storestatus(repo, originalwd, target, state, collapse, keep, keepbranches,
                 external, activebookmark):