[3.11] gh-93883: elide traceback indicators when possible (GH-93994) (GH-94740)

Elide traceback column indicators when the entire line of the
frame is implicated.  This reduces traceback length and draws
more attention to the remaining (very relevant) indicators.

Example:
```
Traceback (most recent call last):
  File "query.py", line 99, in <module>
    bar()
  File "query.py", line 66, in bar
    foo()
  File "query.py", line 37, in foo
    magic_arithmetic('foo')
  File "query.py", line 18, in magic_arithmetic
    return add_counts(x) / 25
           ^^^^^^^^^^^^^
  File "query.py", line 24, in add_counts
    return 25 + query_user(user1) + query_user(user2)
                ^^^^^^^^^^^^^^^^^
  File "query.py", line 32, in query_user
    return 1 + query_count(db, response['a']['b']['c']['user'], retry=True)
                               ~~~~~~~~~~~~~~~~~~^^^^^
TypeError: 'NoneType' object is not subscriptable
```

Automerge-Triggered-By: GH:pablogsal

1 files changed, 4 insertions, 9 deletions

diff --git a/Lib/idlelib/idle_test/test_run.py b/Lib/idlelib/idle_test/test_run.py
index d859ffc..ec4637c 100644
--- a/Lib/idlelib/idle_test/test_run.py
+++ b/Lib/idlelib/idle_test/test_run.py
@@ -3,7 +3,7 @@
 from idlelib import run
 import io
 import sys
-from test.support import captured_output, captured_stderr, has_no_debug_ranges
+from test.support import captured_output, captured_stderr
 import unittest
 from unittest import mock
 import idlelib
@@ -33,14 +33,9 @@ class ExceptionTest(unittest.TestCase):
                         run.print_exception()
 
         tb = output.getvalue().strip().splitlines()
-        if has_no_debug_ranges():
-            self.assertEqual(11, len(tb))
-            self.assertIn('UnhashableException: ex2', tb[3])
-            self.assertIn('UnhashableException: ex1', tb[10])
-        else:
-            self.assertEqual(13, len(tb))
-            self.assertIn('UnhashableException: ex2', tb[4])
-            self.assertIn('UnhashableException: ex1', tb[12])
+        self.assertEqual(11, len(tb))
+        self.assertIn('UnhashableException: ex2', tb[3])
+        self.assertIn('UnhashableException: ex1', tb[10])
 
     data = (('1/0', ZeroDivisionError, "division by zero\n"),
             ('abc', NameError, "name 'abc' is not defined. "