matplotlib
diff --git a/‎lib/matplotlib/lines.py
Copy file name to clipboardExpand all lines: lib/matplotlib/lines.py
+4-1Lines changed: 4 additions & 1 deletion b/‎lib/matplotlib/lines.py
Copy file name to clipboardExpand all lines: lib/matplotlib/lines.py
+4-1Lines changed: 4 additions & 1 deletion
diff --git a/‎lib/matplotlib/tests/test_axes.py
Copy file name to clipboardExpand all lines: lib/matplotlib/tests/test_axes.py
+7Lines changed: 7 additions & 0 deletions b/‎lib/matplotlib/tests/test_axes.py
Copy file name to clipboardExpand all lines: lib/matplotlib/tests/test_axes.py
+7Lines changed: 7 additions & 0 deletions
@@ -370,7 +370,10 @@ def __init__(self, xdata, ydata,
         self.set_color(color)
         if marker is None:
             marker = 'none'  # Default.
-        self._marker = MarkerStyle(marker, fillstyle)
+        if not isinstance(marker, MarkerStyle):
+            self._marker = MarkerStyle(marker, fillstyle)
+        else:
+            self._marker = marker
 
         self._markevery = None
         self._markersize = None
 
@@ -4906,6 +4906,13 @@ def test_shared_with_aspect_3():
             assert round(expected, 4) == round(ax.get_aspect(), 4)
 
 
+def test_shared_aspect_error():
+    fig, axes = plt.subplots(1, 2, sharex=True, sharey=True)
+    axes[0].axis("equal")
+    with pytest.raises(RuntimeError, match=r"set_aspect\(..., adjustable="):
+        fig.draw_without_rendering()
+
+
 @pytest.mark.parametrize('twin', ('x', 'y'))
 def test_twin_with_aspect(twin):
     fig, ax = plt.subplots()