Issue 5150: Add rstrip() option to IDLE's format menu.
diff --git a/Lib/idlelib/config-extensions.def b/Lib/idlelib/config-extensions.def
index 2d5cf68..78b68f6 100644
--- a/Lib/idlelib/config-extensions.def
+++ b/Lib/idlelib/config-extensions.def
@@ -86,3 +86,9 @@
 fgcolor=Black
 [CodeContext_bindings]
 toggle-code-context=
+
+[RstripExtension]
+enable=1
+enable_shell=0
+enable_editor=1
+