Refactor

Author: GuillaumeFavelier

mne/viz/backends/_qt.py

@@ -506,10 +506,14 @@ def show(self):
         with _qt_disable_paint(self.plotter):
             with self._window_ensure_minimum_sizes():
                 self.plotter.app_window.show()
-        self.plotter._render()
         self._update()
         self._process_events()
 
+    def _update(self):
+        super()._update()
+        for plotter in self._all_plotters:
+            plotter._render()
+
 
 def _create_dock_widget(window, name, area):
     dock = QDockWidget()