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LibWeb: Bring CSS line-height
closer to other engines
This patch makes a few changes to the way we calculate line-height: - `line-height: normal` is now resolved using metrics from the used font (specifically, round(A + D + lineGap)). - `line-height: calc(...)` is now resolved at style compute time. - `line-height` values are now absolutized at style compute time. As a consequence of the above, we no longer need to walk the DOM ancestor chain looking for line-heights during style computation. Instead, values are inherited, resolved and absolutized locally. This is not only much faster, but also makes our line-height metrics match those of other engines like Gecko and Blink.
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commit
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385 changed files with 6889 additions and 6893 deletions
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@ -1,16 +1,16 @@
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Viewport <#document> at (0,0) content-size 800x600 children: not-inline
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BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
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BlockContainer <body> at (8,8) content-size 784x78.609375 children: inline
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line 0 width: 78.9375, height: 78.609375, bottom: 78.609375, baseline: 60.890625
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frag 0 from TextNode start: 0, length: 1, rect: [8,25 39.09375x55.8125]
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BlockContainer <body> at (8,8) content-size 784x79 children: inline
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line 0 width: 78.9375, height: 79, bottom: 79, baseline: 61.09375
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frag 0 from TextNode start: 0, length: 1, rect: [8,25 39.09375x56]
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"H"
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frag 1 from TextNode start: 0, length: 1, rect: [47,38 19.78125x39.625]
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frag 1 from TextNode start: 0, length: 1, rect: [47,38 19.78125x40]
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"e"
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frag 2 from TextNode start: 0, length: 1, rect: [67,47 6.8125x28.125]
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frag 2 from TextNode start: 0, length: 1, rect: [67,47 6.8125x28]
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"l"
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frag 3 from TextNode start: 0, length: 1, rect: [74,53 4.84375x19.96875]
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frag 3 from TextNode start: 0, length: 1, rect: [74,53 4.84375x20]
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"l"
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frag 4 from TextNode start: 0, length: 1, rect: [79,57 8.40625x14.171875]
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frag 4 from TextNode start: 0, length: 1, rect: [79,58 8.40625x14]
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"o"
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InlineNode <span>
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TextNode <#text>
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@ -26,7 +26,7 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
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ViewportPaintable (Viewport<#document>) [0,0 800x600]
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PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
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PaintableWithLines (BlockContainer<BODY>) [8,8 784x78.609375]
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PaintableWithLines (BlockContainer<BODY>) [8,8 784x79]
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InlinePaintable (InlineNode<SPAN>)
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TextPaintable (TextNode<#text>)
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InlinePaintable (InlineNode<SPAN>)
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