dirstate.status: if a file is marked as copied, consider it modified

After a "hg copy --force --after somefile cleanfile", cleanfile
shouldn't be considered clean anymore.

mercurial/dirstate.py

@@ -472,8 +472,9 b' class dirstate(object):'
             if type_ == 'n':
                 if not st:
                     st = os.lstat(self.wjoin(fn))
-                if size >= 0 and (size != st.st_size
-                                  or (mode ^ st.st_mode) & 0100):
+                if (size >= 0 and (size != st.st_size
+                                   or (mode ^ st.st_mode) & 0100)
+                    or fn in self._copymap):
                     modified.append(fn)
                 elif time != int(st.st_mtime):
                     lookup.append(fn)

tests/test-copy2

@@ -44,4 +44,10 b' hg add baz'
 hg cp -A bar baz
 hg st -C
 
+echo "# foo was clean:"
+hg st -AC foo
+echo "# but it's considered modified after a copy --after --force"
+hg copy -Af bar foo
+hg st -AC foo
+
 exit 0

tests/test-copy2.out

@@ -23,3 +23,8 b' bar renamed from foo:dd12c926cf165e3eb4c'
 # copy --after on an added file
 A baz
   bar
+# foo was clean:
+C foo
+# but it's considered modified after a copy --after --force
+M foo
+  bar