Merge pull request matplotlib#21278 from anntzer/addfontcache

Clear findfont cache when calling addfont().

Author: QuLogic

lib/matplotlib/font_manager.py

@@ -1092,6 +1092,7 @@ def addfont(self, path):
             font = ft2font.FT2Font(path)
             prop = ttfFontProperty(font)
             self.ttflist.append(prop)
+        self._findfont_cached.cache_clear()
 
     @property
     def defaultFont(self):