fix typing after <a><strong>test</strong></a>
fix typing after <a><strong>test</strong></a>

right before mutation events are fired the tags will swap places, can
confirm by logging synchronous MutationEvent

quilljs/quill,sferoze/quilljs,sferoze/quilljs,sferoze/quilljs,quilljs/quill,sferoze/quilljs,quilljs/quill