Allow controlling min select-to-zoom sizes

[axelboc]

I'm adding a prop called minZoom to both SelectToZoom and AxialSelectToZoom to allow changing the default min zoom size of 20px.

[loichuder]

I understand the rationale behind the default minimal value when it was not configurable.

But now, I think it would make sense to not set a default value for minZoom and have no check when it is not supplied. It would be up to consumers such as @h5web/app to set this minimal value themselves.

What do you think ?

[axelboc]

While I agree with your sentiment, having "no check when it is not supplied" isn't great as the bug of dragging while clicking is subtle and might not be noticed by developers. minZoom has to be provided somehow, so it can either be mandatory or have a default value of at least a few pixels.

I would personally prefer to keep a sensible default on the low-level components, perhaps less opinionated than 20px, like 5 or 10?

If you prefer, I can make minZoom required on the low-level components, but then I'd still need a default for DefaultInteractions.

[loichuder]

While I agree with your sentiment, having "no check when it is not supplied" isn't great as the bug of dragging while clicking is subtle and might not be noticed by developers.

Yeah. Agreed. Let's ship it with 20px then.