If I remember correctly, whenever you call setWidgetLeftWidth() or any of the other layout methods, the LayoutPanel will call animate(0); internally. This schedules a LayoutCommand using Scheduler.get().scheduleFinally() which means the layout change happens after all of your code in the current event loop has done its work. Its implemented that way for performance: Inside the current event loop you can call as many layout methods as you like and the layout is done all at once in a finally command and not after every layout method call. If you need the changes to take effect immediately you have to call LayoutPanel.forceLayout(). Also sometimes you just need a Scheduler.get().scheduleDeferred() command to read changed width/height values because the browser needs some time to re-render your widget. Only when its re-rendered the browser can give you the new, correct width/height values. So if you ever see strange width/height values, try a scheduleDeferred.
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