Canvas item proximity event?

I want to be able to receive events when the mouse cursor get close to a
canvas item, not just right over it. I can think of three solutions:

1. use some kind of built-in mechanism for this.

2. put a transparent item under the item, that looks like the original item
but with a bit thicker outline.

3. make my own item that can do this.

Nr 1 looks like a good solution, but I dont think it exists. Right?
Nr 2 smells HACK.
Nr 3 smells like hard work ;)

So, basically what I need to know, can I forget about nr 1?


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