Subpixel glyph positioning and layout linearity #1921
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... for offsetting and scaling text
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Depends on pop-os/cosmic-text#143.
The changes in this PR leverage the layout linearity properties from
cosmic-textto unify the measurement and rendering caches in our text pipelines, offsetting and scaling glyphs during rendering.This should fix any layout inconsistencies between measuring (in logical units) and rendering (in physical units).
Fixes #308.