Move frame registration into a shared helper function

Author: pdepetro

src/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_suspended_frames.py

@@ -394,29 +394,25 @@ def track(self, thread_id, frames_list, frame_custom_thread_id=None):
 
             frame_ids_from_thread = self._thread_id_to_frame_ids.setdefault(coroutine_or_main_thread_id, [])
 
-            self._thread_id_to_frames_list[coroutine_or_main_thread_id] = frames_list
-            for frame in frames_list:
+            def _register_frame(frame):
                 frame_id = id(frame)
                 self._frame_id_to_frame[frame_id] = frame
                 _FrameVariable(self.py_db, frame, self._register_variable)  # Instancing is enough to register.
                 self._suspended_frames_manager._variable_reference_to_frames_tracker[frame_id] = self
                 frame_ids_from_thread.append(frame_id)
-
                 self._frame_id_to_main_thread_id[frame_id] = thread_id
 
+            self._thread_id_to_frames_list[coroutine_or_main_thread_id] = frames_list
+            for frame in frames_list:
+                _register_frame(frame)
+
             # Also track frames from chained exceptions (e.g. __cause__ / __context__)
             # so that variable evaluation works for chained exception frames displayed
             # in the call stack.
             chained = getattr(frames_list, 'chained_frames_list', None)
             while chained is not None and len(chained) > 0:
                 for frame in chained:
-                    frame_id = id(frame)
-                    self._frame_id_to_frame[frame_id] = frame
-                    _FrameVariable(self.py_db, frame, self._register_variable)
-                    self._suspended_frames_manager._variable_reference_to_frames_tracker[frame_id] = self
-                    frame_ids_from_thread.append(frame_id)
-
-                    self._frame_id_to_main_thread_id[frame_id] = thread_id
+                    _register_frame(frame)
                 chained = getattr(chained, 'chained_frames_list', None)
 
             frame = None