FIX: do not cache canvas object (#13606)

Author: tacaswell

doc/changes/dev/13606.bugfix.rst

@@ -0,0 +1 @@
+Fix bug where :func:`mne.viz.plot_raw` would access incorrect matplotlib attributes, by :newcontrib:`Thomas Caswell`.

doc/changes/names.inc

@@ -326,6 +326,7 @@
 .. _Teon Brooks: https://github.com/teonbrooks
 .. _Tharupahan Jayawardana: https://github.com/tharu-jwd
 .. _Thomas Binns: https://github.com/tsbinns
+.. _Thomas Caswell: https://tacaswell.github.io
 .. _Thomas Hartmann: https://github.com/thht
 .. _Thomas Radman: https://github.com/tradman
 .. _Théodore Papadopoulo: https://github.com/papadop

mne/viz/tests/test_raw.py

@@ -318,16 +318,13 @@ def test_scale_bar(browser_backend):
         assert_allclose(y_lims, bar_lims, atol=1e-4)
 
 
-def test_plot_raw_selection(raw, browser_backend, monkeypatch):
+def test_plot_raw_selection(raw, browser_backend):
     """Test selection mode of plot_raw()."""
     ismpl = browser_backend.name == "matplotlib"
     with raw.info._unlock():
         raw.info["lowpass"] = 10.0  # allow heavy decim during plotting
     browser_backend._close_all()  # ensure all are closed
     assert browser_backend._get_n_figs() == 0
-    # https://github.com/matplotlib/matplotlib/issues/30575
-    monkeypatch.setattr(mne.viz.utils, "_BLIT_KWARGS", dict(useblit=False))
-    monkeypatch.setattr(mne.viz._mpl_figure, "_BLIT_KWARGS", dict(useblit=False))
     fig = raw.plot(group_by="selection", proj=False)
     assert browser_backend._get_n_figs() == 2
     sel_fig = fig.mne.fig_selection
@@ -496,13 +493,10 @@ def test_plot_raw_child_figures(raw, browser_backend):
     fig._resize_by_factor(0.5)
 
 
-def test_orphaned_annot_fig(raw, browser_backend, monkeypatch):
+def test_orphaned_annot_fig(raw, browser_backend):
     """Test that annotation window is not orphaned (GH #10454)."""
     if browser_backend.name != "matplotlib":
         return
-    # https://github.com/matplotlib/matplotlib/issues/30575
-    monkeypatch.setattr(mne.viz.utils, "_BLIT_KWARGS", dict(useblit=False))
-    monkeypatch.setattr(mne.viz._mpl_figure, "_BLIT_KWARGS", dict(useblit=False))
     assert browser_backend._get_n_figs() == 0
     fig = raw.plot()
     _spawn_child_fig(fig, "fig_annotation", browser_backend, "a")
@@ -527,7 +521,7 @@ def _norm():
         fig.showNormal = _norm
 
 
-def test_plot_raw_keypresses(raw, browser_backend, monkeypatch):
+def test_plot_raw_keypresses(raw, browser_backend):
     """Test keypress interactivity of plot_raw()."""
     with raw.info._unlock():
         raw.info["lowpass"] = 10.0  # allow heavy decim during plotting

mne/viz/utils.py

@@ -1656,7 +1656,6 @@ def __init__(
         from matplotlib.widgets import LassoSelector
 
         self.fig = ax.figure
-        self.canvas = ax.figure.canvas
         self.collection = collection
         self.names = names
         self.alpha_selected = alpha_selected
@@ -1722,14 +1721,14 @@ def on_select(self, verts):
 
         # Don't respond to single clicks without extra keys being hold down.
         # Figures like plot_evoked_topo want to do something else with them.
-        if len(verts) <= 3 and self.canvas._key not in ["control", "ctrl+shift"]:
+        if len(verts) <= 3 and self.fig.canvas._key not in ["control", "ctrl+shift"]:
             return
 
         path = Path(verts)
         inds = np.nonzero([path.intersects_path(p) for p in self.paths])[0]
-        if self.canvas._key == "control":  # Appending selection.
+        if self.fig.canvas._key == "control":  # Appending selection.
             self.selection_inds = np.union1d(self.selection_inds, inds).astype("int")
-        elif self.canvas._key == "ctrl+shift":
+        elif self.fig.canvas._key == "ctrl+shift":
             self.selection_inds = np.setdiff1d(self.selection_inds, inds).astype("int")
         else:
             self.selection_inds = inds
@@ -1739,9 +1738,9 @@ def on_select(self, verts):
 
     def select_one(self, ind):
         """Select or deselect one sensor."""
-        if self.canvas._key == "control":
+        if self.fig.canvas._key == "control":
             self.selection_inds = np.union1d(self.selection_inds, [ind])
-        elif self.canvas._key == "ctrl+shift":
+        elif self.fig.canvas._key == "ctrl+shift":
             self.selection_inds = np.setdiff1d(self.selection_inds, [ind])
         else:
             return  # don't notify()
@@ -1768,7 +1767,7 @@ def style_objects(self):
         self.collection.set_facecolors(self.fc)
         self.collection.set_edgecolors(self.ec)
         self.collection.set_linewidths(self.lw)
-        self.canvas.draw_idle()
+        self.fig.canvas.draw_idle()
 
     def disconnect(self):
         """Disconnect the lasso selector."""
@@ -1777,7 +1776,7 @@ def disconnect(self):
         self.ec[:, -1] = self.alpha_selected
         self.collection.set_facecolors(self.fc)
         self.collection.set_edgecolors(self.ec)
-        self.canvas.draw_idle()
+        self.fig.canvas.draw_idle()
 
 
 def _get_color_list(*, remove=None):