Transition animation not correct the first time changing the content

[tobbi007]

When you change the Content the first time, FancyPanel will always use the Fade Transition only, even when you enabled zoom transition.

Steps to reproduce:

• Go to http://siika.fi:8080/FancyLayoutsDemo/

• Klick FancyPanel

• Checkmark on zoom

• Click Panel content A --> no transition at all which is okay for me

• Click Panel content B --> Results in fade transition only

• Click Panel content A again --> Fade & Zoom transition finally working

Tested on Firefox 55 and Chrome 60.
Also reproduced with Vaadin 8.1pre.