Support font synthesis; remove deps harfbuzz-rs & fontdue; update deps #95
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Font synthesis is now propagated and applied to
ab_glyphandrustybuzzfont faces (Swash requires this be applied downstream when rastering glyphs). Caveat: font metrics available throughScaledFaceRefare not adjusted; results when using font variations withoutrustybuzzmay not account for adjusted glyph size properly while cursor position, highlights and decorations may not be perfect. So far my testing hasn't found any big issues however.https://github.com/harfbuzz/harfbuzz_rs is removed as a dependency since it appears to be unmaintained and is redundant with
rustybuzz. https://github.com/mooman219/fontdue is removed as a dependency since it doesn't appear to support font synthesis and is redundant withab_glyphandswash.The
kas-textversion is bumped to v0.8.0 since there are breaking changes, though release is not planned just yet. README tweaks.