FIX: mro issue with pyside/pyqt4

tacaswell · tacaswell · commit f67ea3c62f33 · 2015-10-06T00:34:41.000-04:00
Do not let a `super` be called or the the c++ base-classes will be initialized twice which causes havoc. - pyside failed on figure creation - pyqt4 may segfault on exit closes #5196
diff --git a/lib/matplotlib/backends/backend_qt4agg.py b/lib/matplotlib/backends/backend_qt4agg.py
@@ -15,7 +15,7 @@
 from matplotlib.figure import Figure
 
 
-from .backend_qt5agg import FigureCanvasQTAggBase
+from .backend_qt5agg import FigureCanvasQTAggBase as _FigureCanvasQTAggBase
 
 from .backend_agg import FigureCanvasAgg
 from .backend_qt4 import QtCore
@@ -54,6 +54,11 @@ def new_figure_manager_given_figure(num, figure):
     return FigureManagerQT(canvas, num)
 
 
+class FigureCanvasQTAggBase(_FigureCanvasQTAggBase):
+    def __init__(self, figure):
+        self._agg_draw_pending = False
+
+
 class FigureCanvasQTAgg(FigureCanvasQTAggBase,
                         FigureCanvasQT, FigureCanvasAgg):
     """
