A user pointed out at a little annoyance in Curves tool that I've
learn't not to care about: deleting a node by selecting it and
pressing Delete doesn't work.
I see consistent behavior between dragging node to border to remove it
and dragging a guide to border to remove it, but could we possibly
make Delete button work too?
Another thing is that there is no obvious way to move nodes
horizontally from keyboard. Left/Right arrow keys cycle selection of
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