Zoom even more.

[CodAffection]

Hi @tryptech,

Thanks for this script.
You've fixed recent bugs with the script, very much appreciated!

I'm using 4K Monitor = 3840 * 2160
My zoom window size is 2880 * 1620 (3/4 of the original size)

So for the zoom operation, my window size would be = 2880 * 1620
Could you extend the zoom feature so that for the second zoom = 2160 * 1215 (3/4 of the current)
and so on ...
an extra hotkey might be needed to zoom out all the way back to the original window size.
wouldn't that be helpful?

Anyway, what you've done here is so good, thank you so much.