Backport PR #30484: FIX: be more cautious about checking widget size

Author: ksunden

lib/matplotlib/backends/backend_qt.py

@@ -517,7 +517,7 @@ def _draw_idle(self):
             if not self._draw_pending:
                 return
             self._draw_pending = False
-            if self.height() <= 0 or self.width() <= 0:
+            if _isdeleted(self) or self.height() <= 0 or self.width() <= 0:
                 return
             try:
                 self.draw()

requirements/testing/all.txt

@@ -6,7 +6,7 @@ coverage!=6.3
 psutil
 pytest!=4.6.0,!=5.4.0,!=8.1.0
 pytest-cov
-pytest-rerunfailures
+pytest-rerunfailures!=16.0
 pytest-timeout
 pytest-xdist
 pytest-xvfb