Document.get().getScrollHeight() returns same value always ?

I call "Document.get().getScrollHeight()" when I have a scrolling area
such that it returns something like 1600.
When I remove widgets such that the vertical scrolling appears, and
call this method again, it returns the same value :(

Why?
I tested it in IE7 and FF 7 (GWT 2.3).

For some reason it always returns the highest value. It returns the
small value when no vertical scrolling appears, but when it once
returned a high value when vertical scrolling is present, it will
return this same high value when I remove this widgets again such that
no vertical scrolling appears.
BTW: the widgets are really removed from the DOM and not just made
invisible.

- Ed

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