I thought that maybe the EPUB3 spec changed NFC normalization of file contents from a requirement to a recommendation, but I'm not positive.
Perhaps I wasn't clear in my previous message. Typing a combined diacritic in another editor, I was not able to find the same sequence after it was saved with Sigil 2.2.1. So I think maybe the concerns remain true. If any type of normalization is done that differs from keyed input, a user may not be able to search their typed text using a different editor, if they use multiple editors or someday wish to switch to another?
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