Make a super call more explicit in GTK Agg backends

Author: QuLogic

lib/matplotlib/backends/backend_gtk3agg.py

@@ -70,8 +70,10 @@ def blit(self, bbox=None):
         self.queue_draw_area(x, y, width, height)
 
     def draw(self):
+        # Call these explicitly because GTK's draw is a GObject method which
+        # isn't cooperative with Python class methods.
         backend_agg.FigureCanvasAgg.draw(self)
-        super().draw()
+        backend_gtk3.FigureCanvasGTK3.draw(self)
 
 
 class FigureManagerGTK3Agg(backend_gtk3.FigureManagerGTK3):

lib/matplotlib/backends/backend_gtk4agg.py

@@ -38,8 +38,10 @@ def on_draw_event(self, widget, ctx):
         return False
 
     def draw(self):
+        # Call these explicitly because GTK's draw is a GObject method which
+        # isn't cooperative with Python class methods.
         backend_agg.FigureCanvasAgg.draw(self)
-        super().draw()
+        backend_gtk4.FigureCanvasGTK4.draw(self)
 
 
 class FigureManagerGTK4Agg(backend_gtk4.FigureManagerGTK4):