From d5f95ec07bb47a4d6554e04d13a979dbeac05f74 Mon Sep 17 00:00:00 2001
From: Terry Jan Reedy <tjreedy@udel.edu>
Date: Sun, 22 Sep 2024 15:51:09 -0400
Subject: [PATCH] gh-112938: IDLE - Fix uninteruptable hang when Shell gets
 rapid continuous output. (#124310)

https://github.com/python/cpython/issues/88496 replaced text.update with text.update_idletasks in colorizer.py and outwin.py to fix test failures on macOS.  While theoretically correct, the result was Shell freezing when receiving continuous short strings to print.  Test: `while 1: 1`.

The guess is that there is no idle time in which to do the screen update.  Reverting the change in one of the files,
outwin, fixes the issue.  Colorizer runs ever 1/20 second and seems to work fine.

When running test-outwin on macOS, alias 'update'
to 'update_idletasks on the text used for testing.
---
 Lib/idlelib/idle_test/test_outwin.py                         | 5 +++++
 Lib/idlelib/outwin.py                                        | 2 +-
 .../next/IDLE/2024-09-21-23-12-18.gh-issue-112938.OeiDru.rst | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/IDLE/2024-09-21-23-12-18.gh-issue-112938.OeiDru.rst

diff --git a/Lib/idlelib/idle_test/test_outwin.py b/Lib/idlelib/idle_test/test_outwin.py
index d6e85ad6744..81f4aad7e95 100644
--- a/Lib/idlelib/idle_test/test_outwin.py
+++ b/Lib/idlelib/idle_test/test_outwin.py
@@ -1,6 +1,7 @@
 "Test outwin, coverage 76%."
 
 from idlelib import outwin
+import sys
 import unittest
 from test.support import requires
 from tkinter import Tk, Text
@@ -18,6 +19,10 @@ class OutputWindowTest(unittest.TestCase):
         root.withdraw()
         w = cls.window = outwin.OutputWindow(None, None, None, root)
         cls.text = w.text = Text(root)
+        if sys.platform == 'darwin':  # Issue 112938
+            cls.text.update = cls.text.update_idletasks
+            # Without this, test write, writelines, and goto... fail.
+            # The reasons and why macOS-specific are unclear.
 
     @classmethod
     def tearDownClass(cls):
diff --git a/Lib/idlelib/outwin.py b/Lib/idlelib/outwin.py
index 5ed3f35a7af..8baa657550d 100644
--- a/Lib/idlelib/outwin.py
+++ b/Lib/idlelib/outwin.py
@@ -112,7 +112,7 @@ class OutputWindow(EditorWindow):
         assert isinstance(s, str)
         self.text.insert(mark, s, tags)
         self.text.see(mark)
-        self.text.update_idletasks()
+        self.text.update()
         return len(s)
 
     def writelines(self, lines):
diff --git a/Misc/NEWS.d/next/IDLE/2024-09-21-23-12-18.gh-issue-112938.OeiDru.rst b/Misc/NEWS.d/next/IDLE/2024-09-21-23-12-18.gh-issue-112938.OeiDru.rst
new file mode 100644
index 00000000000..0cd058eeffb
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2024-09-21-23-12-18.gh-issue-112938.OeiDru.rst
@@ -0,0 +1 @@
+Fix uninteruptable hang when Shell gets rapid continuous output.