Update suggest.min.js for [26333].

see #26110, #27599.
fixes #27621.

git-svn-id: https://develop.svn.wordpress.org/trunk@27911 602fd350-edb4-49c9-b593-d223f7449a82
Widget Customizer: Don't use opacity for the update spinner.

`opacity` isn't supported in IE8 and makes the spinner always visible.

see #27485.

git-svn-id: https://develop.svn.wordpress.org/trunk@27912 602fd350-edb4-49c9-b593-d223f7449a82
Widget Customizer: Restore deferral of `previewer-loading` class removal until preview is synced.

props westonruter.
fixes #27635.

git-svn-id: https://develop.svn.wordpress.org/trunk@27913 602fd350-edb4-49c9-b593-d223f7449a82