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Due to an obscure bug, this function will not work on listboxes that have elements using images located in the mission folder (as opposed to located inside of a pbo/ebo file). If the listbox has no images (set with lbSetPicture, the function will run fine.
This function should also not be used on listboxes where some elements have pictures, and some do not. In this case, text indenting will be unpredictable.