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Weston Ruter 78b73c8906 Customizer: Defer embedding widget controls to improve DOM performance and initial load time.
The Menu Customizer feature includes a performance technique whereby the controls for nav menu items are only embedded into the DOM once the containing menu section is expanded. This commit implements the same DOM deferral for widgets but goes a step further than just embedding the controls once the widget area's Customizer section is expanded: it also defers the embedding of the widget control's form until the widget is expanded, at which point the `widget-added` event also fires to allow any additional widget initialization to be done. The deferred DOM embedding can speed up initial load time by 10x or more. This DOM deferral also yields a reduction in overall memory usage in the browser process.

Includes changes to `wp_widget_control()` to facilitate separating out the widget form from the surrounding accordion container; also includes unit tests for this previously-untested function. Also included are initial QUnit tests (finally) for widgets in the Customizer.

Fixes #33901.


git-svn-id: https://develop.svn.wordpress.org/trunk@34563 602fd350-edb4-49c9-b593-d223f7449a82
2015-09-25 21:01:46 +00:00
src Customizer: Defer embedding widget controls to improve DOM performance and initial load time. 2015-09-25 21:01:46 +00:00
tests Customizer: Defer embedding widget controls to improve DOM performance and initial load time. 2015-09-25 21:01:46 +00:00
tools/i18n i18n tools: Use https for `msgid-bugs-address` URLs. 2015-07-27 19:37:13 +00:00
.editorconfig Use HTTPS URLs for codex.wordpress.org. 2015-04-12 21:28:58 +00:00
.gitignore Ignore `.DS_Store` files. 2015-03-13 18:11:33 +00:00
.jshintrc Update `grunt-contrib-jshint` to `0.11.0` 2015-03-06 21:07:35 +00:00
.travis.yml Fix tabs vs spaces in .travis.yml 2015-09-25 20:12:09 +00:00
Gruntfile.js Speed up `browserify` builds, don't `uglify` the media builds on `watch`. 2015-09-09 02:11:23 +00:00
package.json Build Tools: Update `grunt-contrib-uglify` to 0.9.2. 2015-08-25 03:27:23 +00:00
phpunit.xml.dist Exclude external-http tests when running `phpunit`. 2014-11-10 14:48:28 +00:00
wp-cli.yml Introduce default `wp-cli.yml` for core development. 2014-04-30 21:35:18 +00:00
wp-config-sample.php Lightly clean up and improve inline documentation in wp-config-sample.php. 2015-05-10 00:05:30 +00:00
wp-tests-config-sample.php Update wp-tests-config-sample.php to run with WP_DEBUG by default. see #25282. 2013-09-23 16:17:59 +00:00