In code view, word underlining works fine by adding it to misspelled words only. However, the spell check dialog also shows well-written words.
I do not know if I am configuring or using something wrong or if it is an problem with Sigil or my current epub. I had understood that adding the
xml:lang="X" was enough for it to work properly.
In the screenshot "informadas" is well-written. Is a test with only 2 words, but i'm working on a large book with a looooot of false positives, so the Spellchecker dialogue is almost unusable for me.
I stay tuned to provide more information if necessary.
Regards.
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Sigil 1.4.3
QT 5.15.2
Gentoo Linux