diff -r 1c51f1650c42 Lib/idlelib/configHandler.py
--- a/Lib/idlelib/configHandler.py	Fri Dec 26 23:08:58 2014 -0800
+++ b/Lib/idlelib/configHandler.py	Sun Dec 28 13:32:20 2014 +0530
@@ -20,6 +20,7 @@
 
 import os
 import sys
+from collections import OrderedDict
 
 from configparser import ConfigParser
 
@@ -67,6 +68,18 @@
         "Load the configuration file from disk."
         self.read(self.file)
 
+    def write(self, fp, space_around_delimiters=True):
+        '''
+        Sorts the sections in ascending lexicographic order before
+        writing to config file. See issue22706.
+        '''
+        sorted_keys = sorted(list(self._sections))
+        sorted_sections = OrderedDict()
+        for key in sorted_keys:
+            sorted_sections[key] = self._sections.get(key)
+        self._sections = sorted_sections
+        ConfigParser.write(self, fp, space_around_delimiters)
+
 class IdleUserConfParser(IdleConfParser):
     """
     IdleConfigParser specialised for user configuration handling.