Allow cursor color change w/o restart. Patch 1725576 Tal Einat.

Lib/idlelib/NEWS.txt

@@ -3,6 +3,8 @@ What's New in IDLE 2.6a1?
 
 *Release date: XX-XXX-200X*
 
+- Update cursor color without restarting.  Patch 1725576 Tal Einat.
+
 - Allow keyboard interrupt only when user code is executing in subprocess.
   Patch 1225 Tal Einat (reworked from IDLE-Spoon).
 

Lib/idlelib/configDialog.py

@@ -1118,12 +1118,15 @@ class ConfigDialog(Toplevel):
     def ActivateConfigChanges(self):
         "Dynamically apply configuration changes"
         winInstances=self.parent.instance_dict.keys()
+        theme = idleConf.CurrentTheme()
+        cursor_color = idleConf.GetHighlight(theme, 'cursor', fgBg='fg')
         for instance in winInstances:
             instance.ResetColorizer()
             instance.ResetFont()
             instance.set_notabs_indentwidth()
             instance.ApplyKeybindings()
             instance.reset_help_menu_entries()
+            instance.text.configure(insertbackground=cursor_color)
 
     def Cancel(self):
         self.destroy()