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-rw-r--r--Lib/idlelib/configDialog.py14
1 files changed, 14 insertions, 0 deletions
diff --git a/Lib/idlelib/configDialog.py b/Lib/idlelib/configDialog.py
index b987293de2..94a9fb8fba 100644
--- a/Lib/idlelib/configDialog.py
+++ b/Lib/idlelib/configDialog.py
@@ -507,6 +507,20 @@ class ConfigDialog(Toplevel):
def VarChanged_builtinTheme(self, *params):
value = self.builtinTheme.get()
+ if value == 'IDLE Dark':
+ tkMessageBox.showwarning(
+ title="The 'IDLE Dark' Text Color Theme",
+ message="IDLE Dark is new in October, 2015. Trying to "
+ "run earlier versions of IDLE with it selected "
+ "will disable colorizing, or worse.\n\n"
+ "If you might ever run an earlier release of IDLE, "
+ "then before exiting this version, "
+ "either switch to another theme or "
+ "hit the 'Save as New Custom Theme' button. "
+ "The latter requires a new name, such as "
+ "'Custom Dark', but the custom theme will work "
+ "with any IDLE release, and can be modified.",
+ parent=self)
self.AddChangedItem('main', 'Theme', 'name', value)
self.PaintThemeSample()