commit a6673806f936b86a3bca79807c05cb925008c52f
author Terry Jan Reedy <tjreedy@udel.edu> Mon Sep 28 04:52:44 2015 -0400
committer Terry Jan Reedy <tjreedy@udel.edu> Mon Sep 28 04:52:44 2015 -0400
tree d49303be6dd05ed6de9253332d28a9c0439d0d6b
parent 62520b2c63334b864b99ae7ed8b71a654d05ac32

Issue #24972: New option is only valid in tk 8.5+.

Lib/idlelib/EditorWindow.py

diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
index 1f4bd9d..1243b95 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -770,8 +770,10 @@
             insertbackground=cursor_color,
             selectforeground=select_colors['foreground'],
             selectbackground=select_colors['background'],
-            inactiveselectbackground=select_colors['background'],
             )
+        if TkVersion >= 8.5:
+            self.text.config(
+                inactiveselectbackground=select_colors['background'])
 
     def ResetFont(self):
         "Update the text widgets' font if it is changed"