feat(dropdown): support separate transition displaytype

In situations where a dropdown was inside a right menu (which got a flex setting) the transition module was taking that flex displaytype setting for the dropdown menu. This unfortunately results into a horizontal menu list.
To be able to adjust this, i added the displayType, used for the transition, setting to the dropdown module as well. If set, this setting could be used just as in transition to correct the display if needed.

Additionally this setting also had to be provided to the hiding transition, otherwise the wrong flex setting would be reapplied before hiding the dropdown again.

src/definitions/modules/dropdown.js

@@ -2136,6 +2136,9 @@ $.fn.dropdown = function(parameters) {
               ;
             }
             return $selectedItem;
+          },
+          displayType: function() {
+            return $module.hasClass('column') ? 'flex' : settings.displayType;
           }
         },
 
@@ -3565,11 +3568,10 @@ $.fn.dropdown = function(parameters) {
               module.set.scrollPosition(module.get.selectedItem(), true);
             }
             if( module.is.hidden($currentMenu) || module.is.animating($currentMenu) ) {
-              var displayType = $module.hasClass('column') ? 'flex' : false;
               if(transition == 'none') {
                 start();
                 $currentMenu.transition({
-                  displayType: displayType
+                  displayType: module.get.displayType()
                 }).transition('show');
                 callback.call(element);
               }
@@ -3582,7 +3584,7 @@ $.fn.dropdown = function(parameters) {
                     duration   : settings.duration,
                     queue      : true,
                     onStart    : start,
-                    displayType: displayType,
+                    displayType: module.get.displayType(),
                     onComplete : function() {
                       callback.call(element);
                     }
@@ -3616,7 +3618,9 @@ $.fn.dropdown = function(parameters) {
 
               if(transition == 'none') {
                 start();
-                $currentMenu.transition('hide');
+                $currentMenu.transition({
+                  displayType: module.get.displayType()
+                }).transition('hide');
                 callback.call(element);
               }
               else if($.fn.transition !== undefined && $module.transition('is supported')) {
@@ -3628,6 +3632,7 @@ $.fn.dropdown = function(parameters) {
                     verbose    : settings.verbose,
                     queue      : false,
                     onStart    : start,
+                    displayType: module.get.displayType(),
                     onComplete : function() {
                       callback.call(element);
                     }
@@ -3956,6 +3961,7 @@ $.fn.dropdown.settings = {
 
   transition             : 'auto',     // auto transition will slide down or up based on direction
   duration               : 200,        // duration of transition
+  displayType            : false,      // displayType of transition
 
   glyphWidth             : 1.037,      // widest glyph width in em (W is 1.037 em) used to calculate multiselect input width