Sortable: Changed floating calculation to determine also whether item…

…s are being displayed horizontally. Helps fix odd sorting behavior for horizontal lists. Fixed #6702 - horizontal sortable not working (and solution)(cherry picked from commit f1d939b)

ui/jquery.ui.sortable.js

@@ -49,8 +49,8 @@ $.widget("ui.sortable", $.ui.mouse, {
 		//Get the items
 		this.refresh();
 
-		//Let's determine if the items are floating
-		this.floating = this.items.length ? (/left|right/).test(this.items[0].item.css('float')) : false;
+		//Let's determine if the items are being displayed horizontally
+		this.floating = this.items.length ? (/left|right/).test(this.items[0].item.css('float')) || (/inline|table-cell/).test(this.items[0].item.css('display')) : false;
 
 		//Let's determine the parent's offset
 		this.offset = this.element.offset();