bpo-41373: IDLE: Fix saving files loaded with no newlines or mixed newlines (GH-21597)
Fixes regression in 3.8.4 and 3.9.0b4.
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
diff --git a/Lib/idlelib/iomenu.py b/Lib/idlelib/iomenu.py
index 74ebefd..8bb2fa6 100644
--- a/Lib/idlelib/iomenu.py
+++ b/Lib/idlelib/iomenu.py
@@ -155,6 +155,17 @@
parent=self.text)
return False
+ if not isinstance(eol_convention, str):
+ # If the file does not contain line separators, it is None.
+ # If the file contains mixed line separators, it is a tuple.
+ if eol_convention is not None:
+ tkMessageBox.showwarning("Mixed Newlines",
+ "Mixed newlines detected.\n"
+ "The file will be changed on save.",
+ parent=self.text)
+ converted = True
+ eol_convention = os.linesep # default
+
self.text.delete("1.0", "end")
self.set_filename(None)
self.fileencoding = fileencoding