Update select2.js

DropDown displayed on the left of select-container if not fit right.

select2.js

@@ -886,11 +886,13 @@ the specific language governing permissions and limitations under the Apache Lic
                 height = this.container.outerHeight(false),
                 width = this.container.outerWidth(false),
                 dropHeight = this.dropdown.outerHeight(false),
+	        viewPortRight = $(window).scrollLeft() + document.documentElement.clientWidth,
                 viewportBottom = $(window).scrollTop() + document.documentElement.clientHeight,
                 dropTop = offset.top + height,
                 dropLeft = offset.left,
                 enoughRoomBelow = dropTop + dropHeight <= viewportBottom,
                 enoughRoomAbove = (offset.top - dropHeight) >= this.body().scrollTop(),
+	        enoughRoomOnRight = dropLeft + dropWidth <= viewPortRight,
                 aboveNow = this.dropdown.hasClass("select2-drop-above"),
                 bodyOffset,
                 above,
@@ -917,6 +919,10 @@ the specific language governing permissions and limitations under the Apache Lic
                 if (!enoughRoomBelow && enoughRoomAbove) above = true;
             }
 
+	    if (!enoughRoomOnRight) {
+		   dropLeft = offset.left + width - dropWidth;
+	    }
+
             if (above) {
                 dropTop = offset.top - dropHeight;
                 this.container.addClass("select2-drop-above");