Fix dropdowns inside overflow containers

RELEASE-NOTES.md

@@ -1,5 +1,13 @@
 ## RELEASE NOTES
 
+### Version 2.2.11 - February 21, 2017
+
+**Bugs**
+
+- **Button** - Fixes `@basicActiveBoxShadow` being used incorrectly in basic button variables
+- **Visibility** - Fixes issue where visibility events would occur improperly when using a `context` that have `overflow-x` or `overflow-y` set to `auto`
+- **Dropdown** - Fixes an issue where dropdown would not correctly open `upward` at bottom edge of the screen when using a `context` with `overflow-x` or `overflow-y` set to `auto`
+
 ### Version 2.2.10 - February 21, 2017
 
 **Bugs**

src/definitions/modules/dropdown.js

@@ -3069,6 +3069,9 @@ $.fn.dropdown = function(parameters) {
                 height: $currentMenu.outerHeight()
               }
             };
+            if(module.is.verticallyScrollableContext()) {
+              calculations.menu.offset.top += calculations.context.scrollTop;
+            }
             onScreen = {
               above : (calculations.context.scrollTop) <= calculations.menu.offset.top - calculations.menu.height,
               below : (calculations.context.scrollTop + calculations.context.height) >= calculations.menu.offset.top + calculations.menu.height
@@ -3142,6 +3145,9 @@ $.fn.dropdown = function(parameters) {
               ? $subMenu.hasClass(className.visible)
               : $menu.hasClass(className.visible)
             ;
+          },
+          verticallyScrollableContext: function() {
+            return $context.get(0) !== window  && $context.css('overflow-y') == 'auto';
           }
         },