Fixes a bug after [45499], where the backbone view element isn't the input field any longer. Also, managing focus programmatically is often an assumption on a specific user flow and should generally be avoided, see #43169. Props dufresnesteven. See #43169. Fixes #48588. Built from https://develop.svn.wordpress.org/trunk@46745 git-svn-id: http://core.svn.wordpress.org/trunk@46545 1a063a9b-81f0-0310-95a4-ce76da25c4cd