Bug report

Bug summary

Animation._end_redraw() method, which is called after window resizing, always calls self._post_draw() with blit=False:

def _end_redraw(self, evt):
    # Now that the redraw has happened, do the post draw flushing and
    # blit handling. Then re-enable all of the original events.
    self._post_draw(None, False)
    self.event_source.start()
    self._fig.canvas.mpl_disconnect(self._resize_id)
    self._resize_id = self._fig.canvas.mpl_connect('resize_event',
                                                   self._handle_resize)

self._fig.canvas.draw_idle() is used directly in this case, and self._drawn_artists is ignored. In a scenario where the plot is updated only when new data points arrive, this leads to a blank window after resize and until you get new data point and a plot update function is executed.

Of course, I can override this behaviour, but the question is why not to call self._post_draw() here as it is called from other places:

self._post_draw(None, self._blit)

Doing this will respect already drawn artists if you resize the window before new data points arrive.

Matplotlib version

• Operating System: Windows 10
• Matplotlib Version: 2.0.2
• Python Version: 2.7.13

Matplotlib and Python are installed as part of Anaconda 4.4.0.