From d351706950a04a785eb37fe907610d3235719bb4 Mon Sep 17 00:00:00 2001
From: Terry Jan Reedy <tjreedy@udel.edu>
Date: Mon, 28 Sep 2015 04:52:49 -0400
Subject: [PATCH] Issue #24972: New option is only valid in tk 8.5+.

---
 Lib/idlelib/EditorWindow.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
index d742dd64f16..a634d1f323a 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -755,8 +755,10 @@ class EditorWindow(object):
             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 + "_"