Merge pull request #2769 from radiohead/patch-1

[Dropdown] Allow `onHide` callbacks to prevent Hiding

src/definitions/modules/dropdown.js

@@ -430,11 +430,12 @@ $.fn.dropdown = function(parameters) {
           ;
           if( module.is.active() ) {
             module.debug('Hiding dropdown');
-            module.animate.hide(function() {
-              module.remove.visible();
-              callback.call(element);
-            });
-            settings.onHide.call(element);
+            if(settings.onHide.call(element) === false) {
+              module.animate.hide(function() {
+                module.remove.visible();
+                callback.call(element);
+              });
+            }
           }
         },