largefile: consider `updatelfiles` as a `parentchange`

This is not strictly a `parentchange`, however this is still some internal
dirstate adjustment as "similar" enough that it seems find to do so.

Differential Revision: https://phab.mercurial-scm.org/D11107

hgext/largefiles/lfcommands.py

@@ -519,6 +519,7 b' def updatelfiles('
             filelist = set(filelist)
             lfiles = [f for f in lfiles if f in filelist]
 
+        with lfdirstate.parentchange():
         update = {}
         dropped = set()
         updated, removed = 0, 0
@@ -564,6 +565,7 b' def updatelfiles('
         # largefile processing might be slow and be interrupted - be prepared
         lfdirstate.write()
 
+        with lfdirstate.parentchange():
         if lfiles:
             lfiles = [f for f in lfiles if f not in dropped]