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Fix #17514 Given the comments I've adjusted this somewhat. The numbers of characters detected are increased and include things like the use of U+300 to make à instead of à and non-breaking spaces. There is a button which can be used to escape the content to show it. Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: Gwyneth Morgan <gwymor@tilde.club> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>