Bug 5677 Hierarchy outline has empty space
I opened a hierarchy view on IActionDelegate. Selected a few of the subinterfaces, changed the expansion state of the tree. Then, no matter which item I selected in the top window (the hierarchy tree), the bottom window (the outline table) always had exactly four empty rows before the first item was listed.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/dialogfields/ListDialogField.java
*/		
	public void removeElement(Object element) throws IllegalArgumentException {
		if (fElements.remove(element)) {
			if (fTable != null) {
				fTable.remove(element);
			}
			dialogFieldChanged();
		} else {
			throw new IllegalArgumentException();
		}
	}
	/**
	 * Removes elements from the list.
	 */		
	public void removeElements(List elements) {
		if (elements.size() > 0) {
			fElements.removeAll(elements);
			if (fTable != null) {
				fTable.remove(elements.toArray());
			}
			dialogFieldChanged();
		}
	}
	/**
	 * Gets the number of elements
	 */		
	public int getSize() {
		return fElements.size();
	}