* Support widgets which are higher than browsers viewport.
* Use widgets width as max-width.
* Don't animate the width of wide widgets to make them visible, instead fade them in/out.
* Fix Chrome flickerings while updating wide widgets.
props adamsilverstein, westonruter, ocean90.
see #27348.
Built from https://develop.svn.wordpress.org/trunk@27798
git-svn-id: http://core.svn.wordpress.org/trunk@27633 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Move `WidgetCustomizerPreview` to `wp.customize.WidgetCustomizerPreview`
* Move `WidgetCustomizerPreview_exports` to export_preview_data()
* Use `_wpWidgetCustomizerPreviewSettings` to transfer settings to `wp.customize.WidgetCustomizerPreview`
see #27485.
Built from https://develop.svn.wordpress.org/trunk@27653
git-svn-id: http://core.svn.wordpress.org/trunk@27496 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Replace Widget_Customizer_Exception with WP_Error
* Call Previewer.cheatin() to show the cheating message if a user can't change widgets
* Call Previewer.login() to show the login form if a user is logged out
* Show a generic error message on failures
see #27419.
Built from https://develop.svn.wordpress.org/trunk@27652
git-svn-id: http://core.svn.wordpress.org/trunk@27495 1a063a9b-81f0-0310-95a4-ce76da25c4cd