component.Base: hide() & show()

I just noticed that inside v8, switching tabs inside the LivePreview no longer hides & shows the "open in new window" button at the top right corner.

the reason is the following logic:

me.vdom.removeDom = true;
me.parent.update()

while a parent update is reasonable, it now needs to increase the depth by one, since the removeDom flag of the child is no longer present inside the scoped vdom otherwise:

me.vdom.removeDom = true;
me.parent.updateDepth = 2;
me.parent.update()