largefiles: fix confusion upon removal of added largefile (issue3176)

This patch makes "hg remove" work the same way on largefiles as it does on
regular Mercurial files.  If you try to remove an added largefile, the removal
fails and you are instead prompted to use "hg forget" to undo the add.

hgext/largefiles/overrides.py

@@ -130,7 +130,7 b' def override_remove(orig, ui, repo, *pat'
     orig(ui, repo, *pats, **opts)
     restorematchfn()
 
-    after, force = opts.get('after'), opts.get('force')
+    after = opts.get('after')
     if not pats and not after:
         raise util.Abort(_('no files specified'))
     m = scmutil.match(repo[None], pats, opts)
@@ -145,12 +145,10 b' def override_remove(orig, ui, repo, *pat'
 
     def warn(files, reason):
         for f in files:
-            ui.warn(_('not removing %s: %s (use -f to force removal)\n')
+            ui.warn(_('not removing %s: %s (use forget to undo)\n')
                     % (m.rel(f), reason))
 
-    if force:
-        remove, forget = modified + deleted + clean, added
-    elif after:
+    if after:
         remove, forget = deleted, []
         warn(modified + added + clean, _('file still exists'))
     else:

tests/test-largefiles.t

@@ -50,6 +50,18 b' Remove both largefiles and normal files.'
   $ hg commit -m "remove files"
   $ ls
   sub
+  $ echo "testlargefile" > large1-test
+  $ hg add --large large1-test
+  $ hg st
+  A large1-test
+  $ hg rm large1-test
+  not removing large1-test: file has been marked for add (use forget to undo)
+  $ hg st
+  A large1-test
+  $ hg forget large1-test
+  $ hg st
+  ? large1-test
+  $ rm large1-test
 
 Copy both largefiles and normal files (testing that status output is correct).