Bug Can't delete quote by pressing del key

[Kirby]

Steps to reprodue

1. Click reply on a post
2. Position the cursor inside the quote at the very beginning
3. Press and hold del key until all text within the quote is removed
4. Release del key and try to delete the quote by pressing del again

Expected Result
The (now empty) quote is deleted

Actual Result
Nothing happens

Also related to https://xenforo.com/community/threa...can-move-up-text-from-following-quote.212019/

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