TinyMCE: manually fire `ExecCommand` when aligning images as we do `preventDefault()` on `BeforeExecCommand` for them. Props avryl, fixes #30565.
Built from https://develop.svn.wordpress.org/trunk@30748


git-svn-id: http://core.svn.wordpress.org/trunk@30738 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor DFW v2: fade out the Screen Options/Help tabs when open. Props avryl, fixes #30593.
Built from https://develop.svn.wordpress.org/trunk@30749


git-svn-id: http://core.svn.wordpress.org/trunk@30739 1a063a9b-81f0-0310-95a4-ce76da25c4cd