revert: have an explicit action for "forget"

The distinction between "remove" and "forget" used to be in special logic
checking for the state of the file in the dirstate. Now that we have dedicated
filtering, we can stop relying on this logic and have two distinct actions.

mercurial/cmdutil.py

@@ -2604,18 +2604,12 b' def revert(ui, repo, ctx, parents, *pats'
                 dsremovunk.add(abs)
         dsremoved -= dsremovunk
 
-        ## computation of the action to performs on `names` content.
-
-        def removeforget(abs):
-            if repo.dirstate[abs] == 'a':
-                return _('forgetting %s\n')
-            return _('removing %s\n')
-
         # action to be actually performed by revert
         # (<list of file>, message>) tuple
         actions = {'revert': ([], _('reverting %s\n')),
                    'add': ([], _('adding %s\n')),
-                   'remove': ([], removeforget),
+                   'remove': ([], _('removing %s\n')),
+                   'forget': ([], _('forgetting %s\n')),
                    'undelete': ([], _('undeleting %s\n')),
                    'noop': (None, _('no changes needed to %s\n')),
                    'unknown': (None, _('file not managed: %s\n')),
@@ -2642,7 +2636,7 b' def revert(ui, repo, ctx, parents, *pats'
             # Added since target
             (added,         actions['remove'],   discard),
             # Added in working directory
-            (dsadded,       actions['remove'],   discard),
+            (dsadded,       actions['forget'],   discard),
             # Removed since  target, before working copy parent
             (removed,       actions['add'],      discard),
             # Same as `removed` but an unknown file exists at the same path
@@ -2717,10 +2711,9 b' def _performrevert(repo, parents, ctx, a'
         repo.wwrite(f, fc.data(), fc.flags())
 
     audit_path = pathutil.pathauditor(repo.root)
+    for f in actions['forget'][0]:
+        repo.dirstate.drop(f)
     for f in actions['remove'][0]:
-        if repo.dirstate[f] == 'a':
-            repo.dirstate.drop(f)
-            continue
         audit_path(f)
         try:
             util.unlinkpath(repo.wjoin(f))