When an item is shown via document.id('element').slide('show') the height is fixed. This is because the complete event isn't triggered so even if the resetHeight options is set to true, the height does not get changed to 'auto'.
Not certain if this is considered a bug, but it is still quite annoying.
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Looks like it does reset the height property: http://jsfiddle.net/K5JuM/2/
When you do a transition there is no problem. It's without the transition thats a problem for me: http://jsfiddle.net/2YW4v/3/
The wrapper now has a fixed height of 180px (in Chrome)
ah, good point..
Probably these lines https://github.com/mootools/mootools-more/blob/d847456e5b/Source/Fx/Fx.Slide.js#L59-60 should go in a separate method, and that method should be called by the onComplete event and by the show() and hide() methods.
That would fix this issue I guess. But two things are unclear to me. Where is the onComplete event being triggered? And why shouldn't show() and hide() trigger this event?