Merge pull request #4353 from asmeurer/completion_no-reset

Don't reset the readline completer after each prompt

IPython/terminal/interactiveshell.py

@@ -572,12 +572,6 b' class TerminalInteractiveShell(InteractiveShell):'
         prompt : str, optional
           A string to be printed to prompt the user.
         """
-        # Code run by the user may have modified the readline completer state.
-        # We must ensure that our completer is back in place.
-
-        if self.has_readline:
-            self.set_readline_completer()
-        
         # raw_input expects str, but we pass it unicode sometimes
         prompt = py3compat.cast_bytes_py2(prompt)