Merge pull request #9950 from mbyt/enable_quit_for_debugging_with_minus_m_IPython.terminal.debugger

Enable quitting for -m IPython.terminal.debugger, which would otherwise unconditionally trap all attempts at exiting.

IPython/terminal/debugger.py

@@ -86,5 +86,11 b' def set_trace(frame=None):'
 
 if __name__ == '__main__':
     import pdb
+    # IPython.core.debugger.Pdb.trace_dispatch shall not catch
+    # bdb.BdbQuit. When started through __main__ and an exception
+    # happened after hitting "c", this is needed in order to
+    # be able to quit the debugging session (see #9950).
+    old_trace_dispatch = pdb.Pdb.trace_dispatch
     pdb.Pdb = TerminalPdb
+    pdb.Pdb.trace_dispatch = old_trace_dispatch
     pdb.main()