ATSUI spacing features with negative values

Test for negative spacing values in complex text rendering.

Each green box should be identical to the blue box it follows, except for accents.

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| Word spacing | Letter spacing | |

יְהִי, אָחִי, לְךָ סֵפֶר שְׁלַחְתִּיו וּמִמְכֶּרֶת צְמִיתוּת לָךְ מְכַרְתִּיו.

Lorèm ipsum dolor sit amèt, consectetuer adipiscing èlit.

Lorem ipsum dolor sit amet, consectetuer adipiscing elit.

|

יְהִי, אָחִי, לְךָ סֵפֶר שְׁלַחְתִּיו וּמִמְכֶּרֶת צְמִיתוּת לָךְ מְכַרְתִּיו.

Lorèm ipsum dolor sit amèt, consectetuèr adipiscing èlit.

Lorem ipsum dolor sit amet, consectetuer adipiscing elit.

|