Promote _mdiff to a standard method

Author: kesara

Lib/difflib.py

@@ -1358,7 +1358,7 @@ def ndiff(a, b, linejunk=None, charjunk=IS_CHARACTER_JUNK):
     """
     return Differ(linejunk, charjunk).compare(a, b)
 
-def _mdiff(fromlines, tolines, context=None, linejunk=None,
+def mdiff(fromlines, tolines, context=None, linejunk=None,
            charjunk=IS_CHARACTER_JUNK):
     r"""Returns generator yielding marked up from/to side by side differences.
 
@@ -2025,7 +2025,7 @@ def make_table(self,fromlines,tolines,fromdesc='',todesc='',context=False,
             context_lines = numlines
         else:
             context_lines = None
-        diffs = _mdiff(fromlines,tolines,context_lines,linejunk=self._linejunk,
+        diffs = mdiff(fromlines,tolines,context_lines,linejunk=self._linejunk,
                       charjunk=self._charjunk)
 
         # set up iterator to wrap lines that exceed desired width

Lib/test/test_difflib.py

@@ -114,7 +114,7 @@ def test_hint_indented_properly_with_tabs(self):
     def test_mdiff_catch_stop_iteration(self):
         # Issue #33224
         self.assertEqual(
-            list(difflib._mdiff(["2"], ["3"], 1)),
+            list(difflib.mdiff(["2"], ["3"], 1)),
             [((1, '\x00-2\x01'), (1, '\x00+3\x01'), True)],
         )