graphlog: fix --removed

"hg log --removed FILE" does not return changesets where FILE was removed, but
ones where FILE was changed and possibly removed. The flag is really here to
disable walkchangerevs() fast path, which cannot see file removals by scanning
filelogs.

hgext/graphlog.py

@@ -250,7 +250,6 b' def revset(repo, pats, opts):'
         'follow_first':     ('_followfirst()', None),
         'no_merges':        ('not merge()', None),
         'only_merges':      ('merge()', None),
-        'removed':          ('removes("*")', None),
         'date':             ('date(%(val)r)', None),
         'branch':           ('branch(%(val)r)', ' or '),
         '_patslog':         ('filelog(%(val)r)', ' or '),

tests/test-glog.t

@@ -1454,8 +1454,6 b' glog always reorders nodes which explain'
   ('group', ('group', ('or', ('or', ('func', ('symbol', 'branch'), ('string', 'default')), ('func', ('symbol', 'branch'), ('string', 'branch'))), ('func', ('symbol', 'branch'), ('string', 'branch')))))
   $ testlog -k expand -k merge
   ('group', ('group', ('or', ('func', ('symbol', 'keyword'), ('string', 'expand')), ('func', ('symbol', 'keyword'), ('string', 'merge')))))
-  $ hg log -G --removed --template 'nodetag {rev}\n' | grep nodetag | wc -l
-  \s*0 (re)
   $ testlog --only-merges
   ('group', ('func', ('symbol', 'merge'), None))
   $ testlog --no-merges
@@ -1646,3 +1644,14 b' Test "set:..." and parent revision'
   ('group', ('group', ('func', ('symbol', '_matchfiles'), ('list', ('string', 'r:'), ('string', 'i:set:copied()')))))
   $ testlog -r "sort(file('set:copied()'), -rev)"
   ('group', ('group', ('func', ('symbol', 'sort'), ('list', ('func', ('symbol', 'file'), ('string', 'set:copied()')), ('negate', ('symbol', 'rev'))))))
+
+Test --removed
+
+  $ testlog --removed
+  ('func', ('symbol', 'all'), None)
+  $ testlog --removed a
+  ('group', ('group', ('func', ('symbol', '_matchfiles'), ('list', ('string', 'r:'), ('string', 'p:a')))))
+  $ testlog --removed --follow a
+  abort: can only follow copies/renames for explicit filenames
+  abort: can only follow copies/renames for explicit filenames
+  abort: can only follow copies/renames for explicit filenames