Issue 24745: Switch from Courier to platform-sensitive TkFixedFont as default
editor font.  This should not affect current customized font selections.
Patch by Mark Roseman.
diff --git a/Lib/idlelib/config-main.def b/Lib/idlelib/config-main.def
index d7ad59f..01a9cf1 100644
--- a/Lib/idlelib/config-main.def
+++ b/Lib/idlelib/config-main.def
@@ -53,7 +53,7 @@
 [EditorWindow]
 width= 80
 height= 40
-font= courier
+font= TkFixedFont
 font-size= 10
 font-bold= 0
 encoding= none