CSS: Apply opacity to absolutely positioned ui icons in IE8. Fixed #6059 - Button: Primary icon "enabled" when button is disabled.

Author: tjvantoll

themes/base/jquery.ui.theme.css

@@ -41,6 +41,7 @@
 .ui-priority-primary, .ui-widget-content .ui-priority-primary, .ui-widget-header .ui-priority-primary { font-weight: bold; }
 .ui-priority-secondary, .ui-widget-content .ui-priority-secondary,  .ui-widget-header .ui-priority-secondary { opacity: .7; filter:Alpha(Opacity=70); font-weight: normal; }
 .ui-state-disabled, .ui-widget-content .ui-state-disabled, .ui-widget-header .ui-state-disabled { opacity: .35; filter:Alpha(Opacity=35); background-image: none; }
+.ui-state-disabled .ui-icon { filter:Alpha(Opacity=35); } /* For IE8 - See #6059 */
 
 /* Icons
 ----------------------------------*/