bpo-38862: IDLE Strip Trailing Whitespace fixes end newlines (GH-17366)
Extra newlines are removed at the end of non-shell files. If the file only has newlines after stripping other trailing whitespace, all are removed, as is done by patchcheck.py.
diff --git a/Lib/idlelib/format.py b/Lib/idlelib/format.py
index 2b09805..4b57a18 100644
--- a/Lib/idlelib/format.py
+++ b/Lib/idlelib/format.py
@@ -408,6 +408,16 @@
if cut < raw:
text.delete('%i.%i' % (cur, cut), '%i.end' % cur)
+ if (text.get('end-2c') == '\n' # File ends with at least 1 newline;
+ and not hasattr(self.editwin, 'interp')): # & is not Shell.
+ # Delete extra user endlines.
+ while (text.index('end-1c') > '1.0' # Stop if file empty.
+ and text.get('end-3c') == '\n'):
+ text.delete('end-3c')
+ # Because tk indexes are slice indexes and never raise,
+ # a file with only newlines will be emptied.
+ # patchcheck.py does the same.
+
undo.undo_block_stop()