I am trying to use letter-spacing.maximum to justification CJK
content. When set letter-spacing.maximum MinOpMax throw exception with
`factor < 0; was: -1`.

After some debug I found on TextLayoutManager.java:1325 it set factor to -1.

    int unsuppressibleLetterSpaces = suppressibleLetterSpace
              ? mapping.letterSpaceCount - 1
              : mapping.letterSpaceCount;

Should we subtract 1 only when mapping.letterSpaceCount greater than 1?

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