Inter: Improve light for Greek, Cyrillic and other “extended” letters

[be5invis]

[Derpitron]

I think this is the result of interpolation for thin styles.

[cssobral2013]

This, in fact, happens in all non-Basic Latin glyphs.

[rsms]

Good progress has been made on these improvements with #215 which landed in master as ed61e4e022fec206b6120f1e438c6bd8d5dab42b

[rsms]

Sample of what is now in master: https://rsms.me/etc/inter-thin-wip-20191127.html

These improvements will be included in the next release toward the end of the year.

[rsms]

More progress has been made on this in #218 which just landed in master.

Samples:

[rsms]

Okay folks. I think that with @KatjaSchimmel’s latest work in #219 which just landed in master we can close this out.

Attached is a PDF sheet overview of all glyphs in the Thin font master (which is in git master right now) as well as a build of git master.
Inter-3.12-0cc708d7cb.zip
Inter-thin-glyphs.pdf

[KatjaSchimmel]

Hey hey! I just saw that the _Inter-thin-glyphs.pdf_ is still showing the interpolation errors. I quickly made another PDF with the current state of the Thin master:
Inter-thin-glyphs-2.pdf

[be5invis]

@KatjaSchimmel PERFECT!

[peczony]

@rsms asked me to repost the bug from #214 here:

Accents in Cyrillic should be placed in the same place as in Latin (sometimes Cyrillic accents are indeed placed a bit farther to the right than Latin accents, but not that far)

[peczony]

See some good examples from Vollkorn, STIX Two, Source Serif Pro, PT Sans

[rsms]

@peczony Thanks! Would you mind pasting the sample text you are using?

[peczony]

Sorry for the late reply. Here it is.

Latin á Cyrillic а́

Also, an accentuated version of the sample text you included earlier might be of some help:

Ру́сские лю́бят гото́вить еду́ и угоща́ть свои́х госте́й. В традицио́нном ру́сском обе́де три основны́х блю́да. Пе́рвым блю́дом всегда́ быва́ет суп.

РУ́ССКИЕ ЛЮ́БЯТ ГОТО́ВИТЬ ЕДУ́ И УГОЩА́ТЬ СВОИ́Х ГОСТЕ́Й. В ТРАДИЦИО́ННОМ РУ́ССКОМ ОБЕ́ДЕ ТРИ ОСНОВНЫ́Х БЛЮ́ДА. ПЕ́РВЫМ БЛЮ́ДОМ ВСЕГДА́ БЫВА́ЕТ СУП.