FIX: be more cautious about checking widget size

tacaswell · tacaswell · commit 4821cd66027a · 2025-08-28T23:21:30.000-04:00
This can fail if the c++ side of the object has already been cleaned up but the Python side is still lingering (due to refs in callbacks). closes #29618
diff --git a/lib/matplotlib/backends/backend_qt.py b/lib/matplotlib/backends/backend_qt.py
@@ -517,7 +517,12 @@ def _draw_idle(self):
             if not self._draw_pending:
                 return
             self._draw_pending = False
-            if self.height() <= 0 or self.width() <= 0:
+            try:
+                if self.height() <= 0 or self.width() <= 0:
+                    return
+            except RuntimeError:
+                # This can happen if the c++ object is already cleaned up
+                # but the Python objects are lingering
                 return
             try:
                 self.draw()
