It seems that since a couple of weeks ago, general pages with the
sizeToParent option once again get the wrong height, resulting in really uncomfortable scrolling behaviour.
As you can see in the video, while the page loads and while resizing the sidebar, the content jumps around a lot due to a horizontal scrollbar appearing and disappearing.
A vertical scrollbar is shown for the whole page, which is unnecessary since the page should have the height of the screen, but seems to be a few pixels higher. The vertical scrollbar covers the iframe, hiding any scrollbars that are present inside the iframe.
PS: It would be really nice if it were possible to upload such videos here directly!