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[patrickemin]

それに関連しているかもしれません。

Smart quotes breaking Quote template

I think this is the issue, in addition to the fact we imitate user input on the textarea on this type of addition to avoid losing the undo history. I believe it can be “solved” with a spellcheck="false" on the element, but it has an obvious downside. What’s causing the issue is the inconsistent quotation, it would work if it had the same style of quotes on both ends – any of these sets can be used: It’s weird that only the second quotation mark got converted when quoting though, both sides…