Backport PR #12092: Update backend_qt5agg to fix PySide2 mem issues

jklymak · jklymak · commit 1a9a5552ac71 · 2018-09-11T12:35:40.000-07:00
diff --git a/lib/matplotlib/backends/backend_qt5agg.py b/lib/matplotlib/backends/backend_qt5agg.py
@@ -63,7 +63,7 @@ def paintEvent(self, e):
             qimage = QtGui.QImage(buf, w, h, QtGui.QImage.Format_ARGB32)
             # Adjust the buf reference count to work around a memory leak bug
             # in QImage under PySide on Python 3.
-            if QT_API == 'PySide' and six.PY3:
+            if QT_API in ('PySide', 'PySide2') and six.PY3:
                 ctypes.c_long.from_address(id(buf)).value = 1
             if hasattr(qimage, 'setDevicePixelRatio'):
                 # Not available on Qt4 or some older Qt5.
