Editor DFW v2: do not fade out on using keyboard shortcuts in TinyMCE (Alt+Shift+letter).
Fixes #30539.
Built from https://develop.svn.wordpress.org/trunk@30693


git-svn-id: http://core.svn.wordpress.org/trunk@30683 1a063a9b-81f0-0310-95a4-ce76da25c4cd