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LibGfx/OpenType: Load x-height metrics from OS/2 table if available
Before this change we always returned the font's point size as the x-height which was basically never correct. We now get it from the OS/2 table (if one with version >= 2 is available in the file). Otherwise we fall back to using the ascent of the 'x' glyph. Most fonts appear to have a sufficiently modern OS/2 table.
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Tests/LibWeb/Layout/expected/css-ex-unit.txt
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Tests/LibWeb/Layout/expected/css-ex-unit.txt
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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 800x177.132812 [BFC] children: not-inline
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BlockContainer <body> at (8,8) content-size 784x161.132812 children: not-inline
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BlockContainer <div> at (8,8) content-size 107.421875x161.132812 children: not-inline
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