TinyMCE: don't show image toolbar for placeholder images. See #30147.
Built from https://develop.svn.wordpress.org/trunk@30361


git-svn-id: http://core.svn.wordpress.org/trunk@30360 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in [30361], see #30147.
Built from https://develop.svn.wordpress.org/trunk@30362


git-svn-id: http://core.svn.wordpress.org/trunk@30361 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: fix the border on the image toolbar arrow. Props afercia, see #30147.
Built from https://develop.svn.wordpress.org/trunk@30363


git-svn-id: http://core.svn.wordpress.org/trunk@30362 1a063a9b-81f0-0310-95a4-ce76da25c4cd