BUG: Remove mathtext default shim for ticker (Fixes #8017)

dopplershift · dopplershift · commit c1d0e4181416 · 2017-03-20T15:48:54.000-06:00
The shim was put in place because the thinking was changing the default
fonts would eliminate the need. That's not the case, as that prevents
other font changes from being reflected when mathtext is used.
diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
@@ -197,16 +197,7 @@ def _divmod(x, y):
 
 
 def _mathdefault(s):
-    """
-    For backward compatibility, in classic mode we display
-    sub/superscripted text in a mathdefault block.  As of 2.0, the
-    math font already matches the default font, so we don't need to do
-    that anymore.
-    """
-    if rcParams['_internal.classic_mode']:
-        return '\\mathdefault{%s}' % s
-    else:
-        return '{%s}' % s
+    return '\\mathdefault{%s}' % s
 
 
 class _DummyAxis(object):
