Fix use of --pylab=auto and --matplotlib=auto

IPython/core/interactiveshell.py

@@ -3654,6 +3654,13 b' class InteractiveShell(SingletonConfigurable):'
             make sense in all contexts, for example a terminal ipython can't
             display figures inline.
         """
+        from .pylabtools import _matplotlib_manages_backends
+
+        if not _matplotlib_manages_backends() and gui in (None, "auto"):
+            # Early import of backend_inline required for its side effect of
+            # calling _enable_matplotlib_integration()
+            import matplotlib_inline.backend_inline
+
         from IPython.core import pylabtools as pt
         gui, backend = pt.find_gui_and_backend(gui, self.pylab_gui_select)