Editor, DFW v2: use a 2D transform to force repaint of the admin toolbar, only on `#wp-toolbar`. Fixes calculating the position of the right sidebar on fade-in and removes any performance and stacking implications. 
Props joemcgill, see #30516.
Built from https://develop.svn.wordpress.org/trunk@30710


git-svn-id: http://core.svn.wordpress.org/trunk@30700 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor: hide the DFW v2 button when editor-expand is off. Fixes #30568.
Built from https://develop.svn.wordpress.org/trunk@30711


git-svn-id: http://core.svn.wordpress.org/trunk@30701 1a063a9b-81f0-0310-95a4-ce76da25c4cd