ENH: Route evoked.plot() through MNELineFigure

doc/changes/dev/13795.newfeature.rst

@@ -0,0 +1 @@
+Made ``evoked.plot()`` instantiate ``MNELineFigure`` when it creates its own figure, aligning this path with the ongoing 2D plotting figure-class refactor discussed in :gh:`7751`.

mne/viz/_mpl_figure.py

@@ -26,7 +26,7 @@
      └ MNELineFigure           Interactive figure for non-scrollable data.
                                Generated by:
                                - spectrum.plot()
-                               - evoked.plot()        TODO Not yet implemented
+                               - evoked.plot()
                                - evoked.plot_white()  TODO Not yet implemented
                                - evoked.plot_joint()  TODO Not yet implemented
 """

mne/viz/evoked.py

@@ -452,10 +452,19 @@ def _plot_evoked(
 
     fig = None
     if axes is None:
-        fig, axes = plt.subplots(len(ch_types_used), 1, layout="constrained")
-        if isinstance(axes, plt.Axes):
-            axes = [axes]
-        fig.set_size_inches(6.4, 2 + len(axes))
+        if plot_type == "butterfly" and hasattr(evoked, "get_channel_types"):
+            from ._mpl_figure import _line_figure
+
+            fig, axes = _line_figure(
+                evoked,
+                picks=picks,
+                figsize=(6.4, 2 + len(ch_types_used)),
+            )
+        else:
+            fig, axes = plt.subplots(len(ch_types_used), 1, layout="constrained")
+            if isinstance(axes, plt.Axes):
+                axes = [axes]
+            fig.set_size_inches(6.4, 2 + len(axes))
 
     if isinstance(axes, plt.Axes):
         axes = [axes]

mne/viz/tests/test_evoked.py

@@ -126,6 +126,7 @@ def test_plot_evoked():
     fig = evoked.plot(
         proj=True, hline=[1], exclude=[], window_title="foo", time_unit="s"
     )
+    assert fig.__class__.__name__ == "MNELineFigure"
     amplitudes = _get_amplitudes(fig)
     assert len(amplitudes) == len(default_picks)
     assert evoked.proj is False