Note that the Paint tool I previously proposed would still live in widgets.py.

Code that provides the proper blit behavior:

def start(self):
    if self.interactive:
        for artist in self.artists:
            artist.set_visible(False)
        self.canvas.draw()
    for artist in self.artists:
        artist.set_animated(self.useblit)
        artist.set_visible(True)
    self.update()

def finish(self):
    if self.interactive:
        for artist in self.artists:
            artist.set_animated(False)
    else:
        for artist in self.artists:
            artist.set_visible(False)
    self.canvas.draw_idle()

👍 from me. I have had similar thoughts (but not done anything about it).

Great, good thing I already started working on it 😉

Just wondering, have you considered the ability to rotate the selector?

You could add a separate rotation handle and give it a different marker type, but I'm going to hold off on that for now.

but I'm going to hold off on that for now.

Not unreasonable at all. I was just mentioning as I can imagine it is a route we may take in the future, and it would be nice not to close the door on the possibility of doing so.

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