text: Also consider HHEA metrics for default line height

Alvin Wong requested to merge alvinwong/krita:alvin/bug472502-line-height into master

If USE_TYPO_METRICS is not set, also get the HHEA ascender/descender/lineGap metrics, then compare it with the OS/2 sTypo metrics and choose the larger line height. This fixes certain fonts having a default line height that is too tight (e.g. Microsoft JhengHei, Source Han Sans).


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