A manual kerning value on a character in right-to-left text changed the
space between it and the character before it in reading order, under
both Auto and Optical kerning. The shaped glyphs of a right-to-left
cluster now also move right by the value, so the space its advance
gains is at its left, between it and the next character in reading
order. Left-to-right text and tracking are unchanged.
Optical kerning no longer takes the left glyph's manual value off the
advance it measures, since right to left the value is in that glyph's
offset as well.
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