From 5c57ffec50e1e86013a236f922ea9a53baec427e 2023-01-03 12:43:16
From: Emilio Graff <1@emil.io>
Date: 2023-01-03 12:43:16
Subject: [PATCH] Don't allow switching gui without detatching

---

diff --git a/IPython/terminal/interactiveshell.py b/IPython/terminal/interactiveshell.py
index 83c0bd7..5fd51e5 100644
--- a/IPython/terminal/interactiveshell.py
+++ b/IPython/terminal/interactiveshell.py
@@ -712,6 +712,8 @@ class TerminalInteractiveShell(InteractiveShell):
     active_eventloop = None
     def enable_gui(self, gui=None):
         print(f'Someone called `enable_gui` with {gui=}.')
+        if self._inputhook is not None and gui is not None:
+            raise RuntimeError("Shell already running a gui event loop.")
         if gui and (gui not in {"inline", "webagg"}):
             # This hook runs with each cycle of the `prompt_toolkit`'s event loop.
             self.active_eventloop, self._inputhook = get_inputhook_name_and_func(gui)