Subfigures become stale when their artists are stale

rcomer · rcomer · commit d229e65bcf2b · 2024-07-11T20:34:06.000+01:00
diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
@@ -64,8 +64,8 @@
 
 
 def _stale_figure_callback(self, val):
-    if self.figure:
-        self.figure.stale = val
+    if (fig := self.get_figure(root=False)) is not None:
+        fig.stale = val
 
 
 class _AxesStack:
diff --git a/lib/matplotlib/tests/test_figure.py b/lib/matplotlib/tests/test_figure.py
@@ -1777,7 +1777,9 @@ def test_subfigure_stale_propagation():
 
     fig.draw_without_rendering()
     assert not fig.stale
+    assert not sfig1.stale
     assert not sfig2.stale
 
     sfig2.stale = True
+    assert sfig1.stale
     assert fig.stale
