Slider: Modified handle and scroll content not to jump twice when han…

…dle is grabbed and dragged from anywhere other than absolute center. Fixed #4467 - Slider: handle jumps a few pixels when clicked.

ui/jquery.ui.slider.js

@@ -309,7 +309,9 @@ $.widget( "ui.slider", $.ui.mouse, {
 				( parseInt( closestHandle.css("marginTop"), 10 ) || 0)
 		};
 
-		this._slide( event, index, normValue );
+		if ( !this.handles.hasClass( "ui-state-hover" ) ) {
+			this._slide( event, index, normValue );
+		}
 		this._animateOff = true;
 		return true;
 	},