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util,readline: NFC-normalize strings before getStringWidth

Rodrigo Muino Tomonari requested to merge github/fork/addaleax/getstringwidth.nfc into master

The assumption here is that decomposed characters render like their composed character equivalents, and that working with the former comes with a risk of over-estimating string widths given that we compute them on a per-code-point basis. The regression test added here (한글 vs 한글) is an example of that happening.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

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