largefiles: properly sync lfdirstate after removing largefiles

The more aggressive synchronization of lfdirstate that was backed out in
1265a3a71d75 masked the problem where lfdirstate would hold an 'R' for a
largefile that was added and then removed without a commit between.  We could
just conditionally call lfdirstate.drop() or lfdirstate.remove() here, but this
also properly updates lfdirstate if the standin doesn't exist for the file
somehow (i.e. call drop instead of remove).

Without this change, the precommit status in the commit command immediately
after the test change lists the removed (and never committed) largefile as 'R'.
It can also lead to situations where the status command reports the same, long
after the commit [1].

[1] http://www.selenic.com/pipermail/mercurial-devel/2015-January/065153.html

hgext/largefiles/overrides.py

@@ -206,12 +206,10 b' def removelargefiles(ui, repo, isaddremo'
             if not opts.get('dry_run'):
                 if not after:
                     util.unlinkpath(repo.wjoin(f), ignoremissing=True)
-                lfdirstate.remove(f)
 
         if opts.get('dry_run'):
             return result
 
-        lfdirstate.write()
         remove = [lfutil.standin(f) for f in remove]
         # If this is being called by addremove, let the original addremove
         # function handle this.
@@ -219,6 +217,12 b' def removelargefiles(ui, repo, isaddremo'
             for f in remove:
                 util.unlinkpath(repo.wjoin(f), ignoremissing=True)
         repo[None].forget(remove)
+
+        for f in remove:
+            lfutil.synclfdirstate(repo, lfdirstate, lfutil.splitstandin(f),
+                                  False)
+
+        lfdirstate.write()
     finally:
         wlock.release()
 

tests/test-largefiles-misc.t

@@ -250,6 +250,7 b' verify that large files in subrepos hand'
 Add a normal file to the subrepo, then test archiving
 
   $ echo 'normal file' > subrepo/normal.txt
+  $ touch large.dat
   $ mv subrepo/large.txt subrepo/renamed-large.txt
   $ hg -R subrepo addremove --dry-run
   removing large.txt
@@ -257,11 +258,19 b' Add a normal file to the subrepo, then t'
   adding renamed-large.txt
   $ hg status -S
   ! subrepo/large.txt
+  ? large.dat
   ? subrepo/normal.txt
   ? subrepo/renamed-large.txt
   $ mv subrepo/renamed-large.txt subrepo/large.txt
   $ hg -R subrepo add subrepo/normal.txt
 
+  $ hg addremove
+  adding large.dat as a largefile
+  $ rm large.dat
+
+  $ hg addremove
+  removing large.dat
+
 Lock in subrepo, otherwise the change isn't archived
 
   $ hg ci -S -m "add normal file to top level"