remove warning message so that we can finally switch on opengl for gridview without the terminal getting spammed

qtgui/mainwindow.py

@@ -141,7 +141,12 @@ class MainWindow(TemplateMainWindow):
         self.patternGrid = PatternGrid(parentView=self.ui.gridView)
         self.ui.gridView.setScene(self.patternGrid)
         self.ui.gridView.setRenderHints(QtGui.QPainter.TextAntialiasing)
-        #self.ui.gridView.setViewport(QtWidgets.QOpenGLWidget())
+        self.ui.gridView.setViewport(QtWidgets.QOpenGLWidget()) #TODO: QT BUG! Review in the far future.
+        #ProxyWidget-Items in an openGl accel. GraphicsView create a ton of messages: Unsupported composition mode
+        #But everything works. Install a message handler to just get rid of the warning.
+        def passHandler(msg_type, msg_log_context, msg_string):
+            pass
+        QtCore.qInstallMessageHandler(passHandler)
 
         self.patternToolbar = QtWidgets.QToolBar()
         self.ui.patternArea.layout().insertWidget(0, self.patternToolbar)