Accordion: Moved the ui-accordion-icons class to the headers to prope…

…rly style nested accordions with varying settings of icons and no icons. Fixes #7880 - Nested accordion.

themes/base/jquery.ui.accordion.css

@@ -12,7 +12,9 @@
.ui-accordion .ui-accordion-header { cursor: pointer; position: relative; margin-top: 2px; zoom: 1; }
.ui-accordion .ui-accordion-header-active { border-bottom: 0; }
.ui-accordion .ui-accordion-heading { display: block; font-size: 1em; padding: .5em .5em .5em .7em; }
.ui-accordion-icons .ui-accordion-heading { padding-left: 2.2em; }
.ui-accordion-icons a.ui-accordion-heading { padding-left: 2.2em; }
.ui-accordion-noicons a.ui-accordion-heading { padding-left: .7em; }
.ui-accordion-icons .ui-accordion-icons a.ui-accordion-heading { padding-left: 2.2em; }
.ui-accordion .ui-accordion-header .ui-accordion-header-icon { position: absolute; left: .5em; top: 50%; margin-top: -8px; }
.ui-accordion .ui-accordion-content { padding: 1em 2.2em; overflow: auto; display: none; zoom: 1; }
.ui-accordion .ui-accordion-content-active { display: block; }

ui/jquery.ui.accordion.js

@@ -119,13 +119,15 @@ $.widget( "ui.accordion", {
			this.active.children( ".ui-accordion-header-icon" )
				.removeClass( icons.header )
				.addClass( icons.activeHeader );
			this.element.addClass( "ui-accordion-icons" );
			this.headers.addClass( "ui-accordion-icons" );
		}
	},

	_destroyIcons: function() {
		this.headers.children( ".ui-accordion-header-icon" ).remove();
		this.element.removeClass( "ui-accordion-icons" );
		this.headers
			.removeClass( "ui-accordion-icons" )
			.children( ".ui-accordion-header-icon" )
				.remove();
	},

	_destroy: function() {