Issue #20640: Add https: to url prefixes so test passes on Darwin.

Lib/idlelib/configHelpSourceEdit.py

@@ -149,7 +149,7 @@ class GetHelpSourceDialog(Toplevel):
                            self.path.get().strip())
             if sys.platform == 'darwin':
                 path = self.result[1]
-                if path.startswith(('www', 'file:', 'http:')):
+                if path.startswith(('www', 'file:', 'http:', 'https:')):
                     pass
                 else:
                     # Mac Safari insists on using the URI form for local files