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This will be used to transmit any svg-relevant data between svg nodes.
This is prep for moving a lot of the SVG logic into Layout nodes.
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This is communicated through the PaintContext::has_focus() flag.
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The text cursor follows slightly different "intuitive" rules than the
regular hit testing. Clicking past the right edge of a text box should
still "hit" the text box, and place the cursor at its end, for example.
We solve this by adding a HitTestType enum that is passed to hit_test()
and determines whether past-the-edge candidates are considered.
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This makes it possible to click links that are above other content due
to stacking context order (e.g via CSS z-index.)
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Oops, we're supposed to sort the *parent's* children, not our own.
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StyleProperties is really only the specified "input" to what eventually
becomes the used/computed style we use for layout and painting.
Unlike StyleProperties, LayoutStyle will have strongly typed values for
everything it contains (i.e no CSS::ValueID or strings, etc.)
This first patch moves z-index into LayoutStyle.
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Let's make way for a slightly-more-cooked style() that will eventually
replace the raw specified_style() for layout and paint purposes.
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The stacking context tree doesn't affect layout at all, so let's move
it into the Painting/ directory. I'm not sure yet if it's worth going
for a fullly separate painting tree. So far I'm thinking a stacking
context tree with pointers into the layout tree might be enough.
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"Paint" matches what we call this in the rest of the system. Let's not
confuse things by mixing paint/render/draw all the time. I'm guilty of
this in more places..
Also rename RenderingContext => PaintContext.
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