Removes contents for sections and panels from being logically nested (in the DOM) in order to eliminate many issues related to using `margin-top` hacks. The element containing the link to expand the content element for panels and sections is now a sibling element to its content element: the content is removed from being nested at initialization. The content element is now available in a `contentContainer` property whereas the head element (containing the link to open the construct) is in a `headContainer` property. The existing `container` property is now a jQuery collection that contains both of these elements. Since the head element is no longer in an ancestor element to the `content` element, the `aria-owns` property is now used to maintain the relationship between the `headContainer` and the `contentContainer`. These changes are also accompanied by an improvement to the animation performance for the sliding panes.
Props delawski, celloexpressions.
Fixes#34391.
Fixes#34344.
Fixes#35947.
git-svn-id: https://develop.svn.wordpress.org/trunk@38648 602fd350-edb4-49c9-b593-d223f7449a82
Widgets panel will not wait to display until the preview loads.
Also fixes problems with `margin-top` in panels where other panels' `active` states change, as well as ensuring sections of deactivated panel collapse before panel is hidden to prevent the pane from becoming empty of controls.
Fixes#33052.
Fixes#33567.
git-svn-id: https://develop.svn.wordpress.org/trunk@35231 602fd350-edb4-49c9-b593-d223f7449a82
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
Sergey Biryukov
Weston Ruter