1 files changed, 16 insertions, 0 deletions
diff --git a/js/vendor/jquery/src/attributes/prop.js b/js/vendor/jquery/src/attributes/prop.js
index da7bc1e86..e127bb08f 100644
--- a/js/vendor/jquery/src/attributes/prop.js
+++ b/js/vendor/jquery/src/attributes/prop.js
@@ -79,6 +79,12 @@ jQuery.extend( {
 	}
 } );
 
+// Support: IE <=11 only
+// Accessing the selectedIndex property
+// forces the browser to respect setting selected
+// on the option
+// The getter ensures a default option is selected
+// when in an optgroup
 if ( !support.optSelected ) {
 	jQuery.propHooks.selected = {
 		get: function( elem ) {
@@ -87,6 +93,16 @@ if ( !support.optSelected ) {
 				parent.parentNode.selectedIndex;
 			}
 			return null;
+		},
+		set: function( elem ) {
+			var parent = elem.parentNode;
+			if ( parent ) {
+				parent.selectedIndex;
+
+				if ( parent.parentNode ) {
+					parent.parentNode.selectedIndex;
+				}
+			}
 		}
 	};
 }