Implement white space collapsing#176
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Storing span length gets problematic if one wants to start modifying the item list while building it (like when collapsing whitespace). Instead signal the end of a span with a separate `SpanEnd` item. This actually slightly simplifies the iteration code and makes spans smaller so is probably worth doing anyway.
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See https://drafts.csswg.org/css-text-4/#white-space-phase-1
See doc comment of
subrandr::layout::inline::WhiteSpaceCollapseInternalDocfor implementation sketch.TODO:
preserve-spacesand use it for WebVTT.White space hanging is future work but I already have a prototype locally.
Note that
white-space-collapse: collapsedoes not have an internal use, it's here as part of my goal of supporting CSS defaults so that a future layout (C) API can use actual CSS defaults as a defaultComputedStyle.