After some research I figured out that GWT's PopupPanel is probably responsible for that behavior. I have some wizard views which contain the custom list mentioned before and these wizards use a PopupPanel which is set to modal. I think there might be a bug in the way PopupPanels cancel events if the PopupPanel is set to modal. But its really strange that it only happens when the mouse cursor hovers text inside a ScrollPanel inside a modal PopupPanel. So maybe its more a WebKit bug.
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