MAGETWO-91504: Mobile PDP accordion widget hides accordion content on phones with iOS

- only scroll to element when element gets out of the viewport

Author: cpartica

lib/web/mage/collapsible.js

@@ -448,7 +448,9 @@ define([
                 if (this.options.animate) {
                     this._animate(showProps);
                 } else {
-                    this.content.get(0).parentElement.scrollIntoView();
+                    if (this._isElementOutOfViewport(this.content.get(0).parentElement)) {
+                        this.content.get(0).parentElement.scrollIntoView();
+                    }
                     this.content.show();
                 }
                 this._open();
@@ -554,6 +556,14 @@ define([
                     }, 1);
                 });
             }
+        },
+
+        /**
+         * @private
+         */
+        _isElementOutOfViewport: function (el) {
+            var rect = el.getBoundingClientRect();
+            return rect.bottom < 0 || rect.right < 0 || rect.left > window.innerWidth || rect.top > window.innerHeight;
         }
     });