Add BoundsRelativeToTop

[Happypig375]

What does this implement/fix? Explain your changes.

There is currently no way to obtain the bounds of an element relative to the whole document instead of relative to the parent. This PR adds that.

[H1Gdev]

What benefits does this PR have for users ?

[Happypig375]

It can determine where to overlay HTML elements over SVG (input boxes), or determine collisions between elements given changing transforms and coordinates.

[Happypig375]

This is a behavior I have to emulate myself by applying parent transforms to the bounds myself, by the way.

[H1Gdev]

Can you give us concrete examples ?
We can not determine if this PR needs to be merged...

[paulushub]

@Happypig375 Please explain the need for this feature.
It is mostly GraphicsPath based operations, can this be implemented as extension method?

[mrbean-bremen]

@paulushub - I would rely on @H1Gdev to review this - I don't really have the inside to say if this is helpful.

[paulushub]

@paulushub - I would rely on @H1Gdev to review this - I don't really have the inside to say if this is helpful.

Testing it now, having merged it into develop branch of my fork. You can checkout my branch, flip between master/develop
and see the difference. So far, it is a useful contribution.
Using the quick test-run dialog I submitted in my PR, this PR already resolved 3 of the 8 exceptions still in the W3C Test Suite (those failing).
So the enhancements to the bounding box computation is useful, with no breaking change so-far, that was why I requested your review.

In fact, I am currently improving the quick test-run dialog to better compare before and after PR changes in the tests.

[mrbean-bremen]

Well, that looks like you have sufficiently reviewed it yourself! Just go ahead in this case...

[Happypig375]

I originally wanted to implement clickable buttons given an area inside the SVG. I later wrote this as an extension method in my code.

[paulushub]

I originally wanted to implement clickable buttons given an area inside the SVG. I later wrote this as an extension method in my code.

Thanks so much for the updates. The PR will still be around as we learn what to include.