Why is my panel's preferred size changing as I resize the window?

I have a JEditorPane inside a JPanel, which is wrapped in a JScrollPane. The JEditorPane contains a wide image and I expect to see horizontal scrollbars if the viewport is smaller than the minimum size needed to display the image.
When my panel is displayed for the first time and the viewport size is smaller than the image, the horizontal scrollbars appear and the size of the scrollable area is set to the width of the image. This is the expected behaviour. When I resize the panel so that its is wider than the image and the scrollbars are no longer needed, the scrollbars disappear. However, when I shrink the panel back, the scrollbars appear at the correct "time" (when the edge of the image is reached), but the scrollable area is too wide, similar to the size I had stretched the panel out to.
I am printing out the preferred size that the panel is returning (which will be used to set the scrollable area), and it seems to keep changing. The preferred size seems to grow with the panel's actual size, but it does not shrink back when I make the panel smaller.
Anyone has any idea on what might be happening?

Welcome to the Sun forums.
>
Anyone has any idea on what might be happening?>It probably has to do with the Java code used. Can you prepare an SSCCE that shows the behaviour?

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