bpo-23544: Disable IDLE Stack Viewer when running user code (GH-17163)

Starting stack viewer when user code is running, including when Debugger is active, hangs or crashes IDLE.

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

1 files changed, 21 insertions, 0 deletions

diff --git a/Lib/idlelib/idle_test/test_mainmenu.py b/Lib/idlelib/idle_test/test_mainmenu.py
index 7ec0368..51d2acc 100644
--- a/Lib/idlelib/idle_test/test_mainmenu.py
+++ b/Lib/idlelib/idle_test/test_mainmenu.py
@@ -2,6 +2,7 @@
 # Reported as 88%; mocking turtledemo absence would have no point.
 
 from idlelib import mainmenu
+import re
 import unittest
 
 
@@ -16,6 +17,26 @@ class MainMenuTest(unittest.TestCase):
     def test_default_keydefs(self):
         self.assertGreaterEqual(len(mainmenu.default_keydefs), 50)
 
+    def test_tcl_indexes(self):
+        # Test tcl patterns used to find menuitem to alter.
+        # On failure, change pattern here and in function(s).
+        # Patterns here have '.*' for re instead of '*' for tcl.
+        for menu, pattern in (
+            ('debug', '.*tack.*iewer'),  # PyShell.debug_menu_postcommand
+            ('options', '.*ode.*ontext'),  # EW.__init__, CodeContext.toggle...
+            ('options', '.*ine.*umbers'),  # EW.__init__, EW.toggle...event.
+            ):
+            with self.subTest(menu=menu, pattern=pattern):
+                for menutup in mainmenu.menudefs:
+                    if menutup[0] == menu:
+                        break
+                else:
+                    self.assertTrue(0, f"{menu} not in menudefs")
+                self.assertTrue(any(re.search(pattern, menuitem[0])
+                                    for menuitem in menutup[1]
+                                    if menuitem is not None),  # Separator.
+                                f"{pattern} not in {menu}")
+
 
 if __name__ == '__main__':
     unittest.main(verbosity=2)