Issue #24820: Add 'IDLE Dark' text color theme, warning, and solution.
diff --git a/Lib/idlelib/configDialog.py b/Lib/idlelib/configDialog.py
index 4a759b4..f5a1c4b 100644
--- a/Lib/idlelib/configDialog.py
+++ b/Lib/idlelib/configDialog.py
@@ -524,6 +524,20 @@
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()