diff --git a/debug_toolbar/utils.py b/debug_toolbar/utils.py
index cc90cf4db..13f7472ad 100644
--- a/debug_toolbar/utils.py
+++ b/debug_toolbar/utils.py
@@ -1,6 +1,5 @@
 import inspect
 import os.path
-import re
 import sys
 from importlib import import_module
 from pprint import pformat
@@ -47,12 +46,11 @@ def omit_path(path):
 
 def tidy_stacktrace(stack):
     """
-    Clean up stacktrace and remove all entries that:
-    1. Are part of Django (except contrib apps)
-    2. Are part of socketserver (used by Django's dev server)
-    3. Are the last entry (which is part of our stacktracing code)
+    Clean up stacktrace and remove all entries that are excluded by the
+    HIDE_IN_STACKTRACES setting.
 
-    ``stack`` should be a list of frame tuples from ``inspect.stack()``
+    ``stack`` should be a list of frame tuples from ``inspect.stack()`` or
+    ``debug_toolbar.utils.get_stack()``.
     """
     trace = []
     for frame, path, line_no, func_name, text in (f[:5] for f in stack):
@@ -201,32 +199,16 @@ def getframeinfo(frame, context=1):
         try:
             lines, lnum = inspect.findsource(frame)
         except Exception:  # findsource raises platform-dependant exceptions
-            first_lines = lines = index = None
+            lines = index = None
         else:
             start = max(start, 1)
             start = max(0, min(start, len(lines) - context))
-            first_lines = lines[:2]
             lines = lines[start : (start + context)]
             index = lineno - 1 - start
     else:
-        first_lines = lines = index = None
-
-    # Code taken from Django's ExceptionReporter._get_lines_from_file
-    if first_lines and isinstance(first_lines[0], bytes):
-        encoding = "ascii"
-        for line in first_lines[:2]:
-            # File coding may be specified. Match pattern from PEP-263
-            # (https://www.python.org/dev/peps/pep-0263/)
-            match = re.search(rb"coding[:=]\s*([-\w.]+)", line)
-            if match:
-                encoding = match.group(1).decode("ascii")
-                break
-        lines = [line.decode(encoding, "replace") for line in lines]
+        lines = index = None
 
-    if hasattr(inspect, "Traceback"):
-        return inspect.Traceback(filename, lineno, frame.f_code.co_name, lines, index)
-    else:
-        return (filename, lineno, frame.f_code.co_name, lines, index)
+    return inspect.Traceback(filename, lineno, frame.f_code.co_name, lines, index)
 
 
 def get_sorted_request_variable(variable):
diff --git a/docs/changes.rst b/docs/changes.rst
index 019a6eac3..7a7cc48fd 100644
--- a/docs/changes.rst
+++ b/docs/changes.rst
@@ -10,6 +10,7 @@ Change log
 * Added pyflame (for flame graphs) to the list of third-party panels.
 * Fixed the cache panel to correctly count cache misses from the get_many()
   cache method.
+* Removed some obsolete compatibility code from the stack trace recording code.
 
 3.4.0 (2022-05-03)
 ------------------