Sam Atkins 28ceeec435 LibWeb: Split Length::relative_length_to_px() by type ...

Length units are either relative to the font, or to the viewport, but
never both. So we can save some work by not gathering font metrics for
a viewport unit, and not retrieving the viewport for a font unit.

Currently this is only helpful when the `to_px(Layout::Node)` method is
called, but since that is 208 places according to CLion, (plus 33
indirect uses via `Length::resolved()`) it still seems worthwhile. :^)

2023-04-29 16:23:50 +02:00

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