In Kmail compose message, if the typed word is highlighted by spell check with squiggly red line underneath, then you cannot tell if the word is also Underlined (eg in rich text) is it possible to have a spell-check highlight red-line that doesn't obliterate the underline? perhaps the red wavy line could appear just beneath the text's underline? Running Kubuntu 20.04, plasma 5.18.5
We use feature from Qt. Perhaps you need to report it to Qt directly.