commit d351706950a04a785eb37fe907610d3235719bb4
author Terry Jan Reedy <tjreedy@udel.edu> Mon Sep 28 04:52:49 2015 -0400
committer Terry Jan Reedy <tjreedy@udel.edu> Mon Sep 28 04:52:49 2015 -0400
tree 272eae2a4668494594dc3f78910c9d231c13da79
parent 507a5c4b4e8950dc4c688f151fc819160ee75873

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 d742dd6..a634d1f 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -755,8 +755,10 @@
             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'])
 
     IDENTCHARS = string.ascii_letters + string.digits + "_"