8e53bd4fcd
When we find a block boundary, it may be current block's boundary or other block's boundary. The lambda assume only the former, but the STR of this bug hits the latter case. So, when user modifies the text before a mail-quote which is a block of `<span>` element should put `<br>` before it rather than end of it. Differential Revision: https://phabricator.services.mozilla.com/D270782
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