context: also take all other arguments than `patch.diff` accept

This is needed to use `context.diff` as a full replacement of `patch.diff`

mercurial/context.py

@@ -294,14 +294,19 b' class basectx(object):'
                               auditor=r.nofsauditor, ctx=self,
                               listsubrepos=listsubrepos, badfn=badfn)
 
-    def diff(self, ctx2=None, match=None, opts=None):
+    def diff(self, ctx2=None, match=None, changes=None, opts=None,
+             losedatafn=None, prefix='', relroot='', copy=None,
+             hunksfilterfn=None):
         """Returns a diff generator for the given contexts and matcher"""
         if ctx2 is None:
             ctx2 = self.p1()
         if ctx2 is not None:
             ctx2 = self._repo[ctx2]
         diffopts = patch.diffopts(self._repo.ui, opts)
-        return patch.diff(self._repo, ctx2, self, match=match, opts=diffopts)
+        return patch.diff(self._repo, ctx2, self, match=match, changes=changes,
+                          opts=diffopts, losedatafn=losedatafn, prefix=prefix,
+                          relroot=relroot, copy=copy,
+                          hunksfilterfn=hunksfilterfn)
 
     def dirs(self):
         return self._manifest.dirs()