Martin von Zweigbergk <martinvonz@google.com> [Sat, 13 Jul 2019 00:17:03 -0700] rev 4743
py3: call branchmap.items() on py3 and continue to call iteritems() on py2
Mercurial's source transformer also replaces the 'def iteritems(' in
branchmap by 'def items(', so we need to call whichever version is
there.
Martin von Zweigbergk <martinvonz@google.com> [Fri, 12 Jul 2019 23:24:04 -0700] rev 4742
py3: switch from iteritems() to items() in the topics extension
The only remaining iteritems() call is on branchmap. That will be
dealt with in the next patch.