[xep-support] Issue with Thai text

[Darren Munt]

We've had an issue reported by a Thai customer. Apparently the diacritics above some of the characters are superimposed when there are multiple marks. I don't pretend to understand the language at all but I guess the sample they sent doesn't look right. So is this something I am doing wrong, or a limitation we're not aware of? See example below where you can see in the top selection of text there is a second diacritic above some of the characters, and in the PDF screenshot, those second marks are overlayed.

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