Don't insert hyphen after existing hyphen during line split. #2739
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This solves #2564. When user provides a hyphenation logic that splits text on existing text, an additional hyphen is added currently.
Before - hyphens are duplicated:

After - hyphens are not duplicated:

Issue reproduction.
I've tested it manually. I don't see existing unit tests for linebreaker.index logic (only for bestFit) and creating them without full understanding of the flow would take me some time.