I'm referring to this edit: I understand that
voilà is only 5 characters long. Or does
à count as two characters? Or do removed characters count towards the limit?
This is just my perspective on it; I don't know exactly how the SE code calculates the changes (apart from having just learned that the differences are calculated after applying Markdown).
According to the Meta SE post How do suggested edits work?, in the section Is there a minimum change threshold for a suggested edit?:
all suggested edits that modify the body in any way must change at least six characters in the post body. Each character added or removed counts as one towards this check.
Apparently SE calculated the removal of "wallah" as six characters, despite one of the
l's as being unchanged if you overlaid the texts.