Regression of bug 1476897, HTMLEditor::InsertAsPlaintextQuotation() refers
|newNode| which is new created <span> element by the method at collapsing
Selection. However, it's already been moved to its out param. Therefore,
after the fix of bug 1476897, it won't collapse Selection. This patch
moves the code moving |newNode| to the out param after collapsing Selection.
Additionally, this makes HTMLEditor::InsertAsCitedQuotationInternal() use
same style code around collapsing Selection since it's also tested by the
new test of nsIEditorMailSupport.insertAsCitedQuotation().
Differential Revision: https://phabricator.services.mozilla.com/D10002
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extra : moz-landing-system : lando
9507d36bda