Backport PR #12167: Set .py tempfile suffix when using vi/emacs editor shortcuts.

IPython/terminal/interactiveshell.py

@@ -322,6 +322,7 b' class TerminalInteractiveShell(InteractiveShell):'
                             mouse_support=self.mouse_support,
                             enable_open_in_editor=self.extra_open_editor_shortcuts,
                             color_depth=self.color_depth,
+                            tempfile_suffix=".py",
                             **self._extra_prompt_options())
 
     def _make_style_from_name_or_cls(self, name_or_cls):

IPython/terminal/shortcuts.py

@@ -250,7 +250,6 b' def newline_autoindent_outer(inputsplitter) -> Callable[..., None]:'
 
 
 def open_input_in_editor(event):
-    event.app.current_buffer.tempfile_suffix = ".py"
     event.app.current_buffer.open_in_editor()