Merge pull request #4156 from gdaunton/dropdown-fix

[Dropdown] Fix issue #4150

src/definitions/collections/menu.less

@@ -296,13 +296,18 @@
   margin-left: 1em;
 }
 .ui.vertical.menu .dropdown.item .menu {
-  top: 0% !important;
   left: 100%;
   min-width: 0;
   margin: 0em 0em 0em @dropdownMenuDistance;
   box-shadow: @dropdownVerticalMenuBoxShadow;
   border-radius: 0em @dropdownMenuBorderRadius @dropdownMenuBorderRadius @dropdownMenuBorderRadius;
 }
+.ui.vertical.menu .dropdown.item.upward .menu {
+  bottom: 0;
+}
+.ui.vertical.menu .dropdown.item:not(.upward) .menu {
+  top: 0;
+}
 .ui.vertical.menu .active.dropdown.item {
   border-top-right-radius: 0em;
   border-bottom-right-radius: 0em;