Fix - Positioning the popover on scrollable elements

* (feat) - add getter for steps property

* (feat) - add setter for steps property / remove duplicate typing

* (fix) - remove duplicated 'currentModePrevented' type

* (fix) - merge

* merge fix

* (fix) - move all methods after scroll detection - success !

* Refactor highlighting active element

src/core/element.js

@@ -190,15 +190,17 @@ export default class Element {
    * @public
    */
   onHighlighted() {
-    this.showPopover();
-    this.showStage();
-
-    this.addHighlightClasses();
-
     const highlightedElement = this;
     if (!highlightedElement.isInView()) {
       highlightedElement.bringInView();
     }
+    
+    // Show the popover and stage once the item has been
+    // brought in the view, this would allow us to handle
+    // the cases where the container has scroll overflow
+    this.showPopover();
+    this.showStage();
+    this.addHighlightClasses();
 
     if (this.options.onHighlighted) {
       this.options.onHighlighted(this);