Iframe example tab dynamic height

[desig9stein]

It would be nice if our iframes Example tab could have his height based on the content inside the iframe. this will help a lot with samples that can change their appearance in run time. For example a stepper switching from horizontal to vertical mode. Currently, we show scrollbar or make the iframe supper tall for both scenarios which live a lot of white space.
Making an iframe example tab height dynamic will eliminate that kind of problems.

[zdrawku]

Postponing for now as it will have to clarify some technical problems.