FIX: qt recursive draw

tacaswell · tacaswell · commit 7ff959cc1acc · 2017-09-18T15:49:11.000-04:00
- put draw_idle in the base canvas resize event
 - re-order our resize handling and Qt's resize handling (let Qt go
   first)
 - do not call processEvents from inside of the paint event (this
   maybe the critical fix)
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -1845,6 +1845,7 @@ def resize_event(self):
         s = 'resize_event'
         event = ResizeEvent(s, self)
         self.callbacks.process(s, event)
+        self.draw_idle()
 
     def close_event(self, guiEvent=None):
         """Pass a `CloseEvent` to all functions connected to ``close_event``.
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -359,9 +359,10 @@ def resizeEvent(self, event):
         winch = w / dpival
         hinch = h / dpival
         self.figure.set_size_inches(winch, hinch, forward=False)
-        FigureCanvasBase.resize_event(self)
-        self.draw_idle()
+        # pass back into Qt to let it finish
         QtWidgets.QWidget.resizeEvent(self, event)
+        # emit our resize events
+        FigureCanvasBase.resize_event(self)
 
     def sizeHint(self):
         w, h = self.get_width_height()
diff --git a/lib/matplotlib/backends/backend_qt5agg.py b/lib/matplotlib/backends/backend_qt5agg.py
@@ -72,7 +72,6 @@ def paintEvent(self, e):
             # since the latter doesn't guarantee that the event will be emitted
             # straight away, and this causes visual delays in the changes.
             self.resizeEvent(event)
-            QtWidgets.QApplication.instance().processEvents()
             # resizeEvent triggers a paintEvent itself, so we exit this one.
             return
 
