commands.remove: don't use workingctx.remove(list, unlink=True)

commands.remove: don't use workingctx.remove(list, unlink=True)

workingctx.remove(list, unlink=True) is unsuited here, because it does too
much: it also unlinks added files. But the command 'hg remove' is specified
to *never* unlink added files.

Instead, we now unlink the files at the commands.remove level (if --after was
not specified) and use workingctx.forget for all files.

As an added bonus, this happens to eliminate a wlock acquire/release pair,
since the previous implementation caused

   acquire wlock
   release wlock
   acquire wlock
   release wlock

where the first pair of acquire/release was caused by the workingctx.forget
call, and the second by the workingctx.remove call.

--- a/mercurial/commands.py	Fri May 27 17:51:16 2011 +0300
+++ b/mercurial/commands.py	Fri May 27 15:59:52 2011 +0200
@@ -8,7 +8,7 @@
 from node import hex, bin, nullid, nullrev, short
 from lock import release
 from i18n import _, gettext
-import os, re, sys, difflib, time, tempfile
+import os, re, sys, difflib, time, tempfile, errno
 import hg, scmutil, util, revlog, extensions, copies, error, bookmarks
 import patch, help, url, encoding, templatekw, discovery
 import archival, changegroup, cmdutil, sshserver, hbisect, hgweb, hgweb.server
@@ -3918,15 +3918,15 @@
             ret = 1
 
     if force:
-        remove, forget = modified + deleted + clean, added
+        list = modified + deleted + clean + added
     elif after:
-        remove, forget = deleted, []
+        list = deleted
         for f in modified + added + clean:
             ui.warn(_('not removing %s: file still exists (use -f'
                       ' to force removal)\n') % m.rel(f))
             ret = 1
     else:
-        remove, forget = deleted + clean, []
+        list = deleted + clean
         for f in modified:
             ui.warn(_('not removing %s: file is modified (use -f'
                       ' to force removal)\n') % m.rel(f))
@@ -3936,12 +3936,25 @@
                       ' to force removal)\n') % m.rel(f))
             ret = 1
 
-    for f in sorted(remove + forget):
+    for f in sorted(list):
         if ui.verbose or not m.exact(f):
             ui.status(_('removing %s\n') % m.rel(f))
 
-    repo[None].forget(forget)
-    repo[None].remove(remove, unlink=not after)
+    wlock = repo.wlock()
+    try:
+        if not after:
+            for f in list:
+                if f in added:
+                    continue # we never unlink added files on remove
+                try:
+                    util.unlinkpath(repo.wjoin(f))
+                except OSError, inst:
+                    if inst.errno != errno.ENOENT:
+                        raise
+        repo[None].forget(list)
+    finally:
+        wlock.release()
+
     return ret
 
 @command('rename|move|mv',