It definitively sounds like a specific font issue. Scintilla uses a fixed line height and I've experienced in the past where it makes the lines too short and it cuts off stuff like underscores which descend below the baseline. @simo98 did you try other fonts with the same result or is it only a specific font? All I could see was a screenshot of a terminal application and showing underscores in the font (hence my "wat" comment).
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