Masayuki Nakano 9494d7d9c7 Bug 1655388 - part 2: Make deleting <br> element after <hr> element in HTMLEditor::HandleDeleteCollapsedSelectionAtAtomicContent() use the new method r=m_kato
Although it does not need to join text nodes around the `<br>` element since
its previous node is `<hr>`, it can use
`WhiteSpaceVisibilityKeeper::DeleteContentNodeAndJoinTextNodesAroundIt()` too.

Depends on D87029

Differential Revision: https://phabricator.services.mozilla.com/D87030
2020-08-18 08:17:17 +00:00
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