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/CheckedListDialogField.java
if (fTable != null) {
			((CheckboxTableViewer)fTable).setChecked(object, state);
		}
	}
	/**
	 * Sets the check state of all elements
	 */	
	public void checkAll(boolean state) {
		if (state) {
			fCheckElements= getElements();
		} else {
			fCheckElements.clear();
		}
		if (fTable != null) {
			((CheckboxTableViewer)fTable).setAllChecked(state);
		}
		checkStateChanged();
	}
	
			
	private void doCheckStateChanged(CheckStateChangedEvent e) {
		if (e.getChecked()) {
			fCheckElements.add(e.getElement());
		} else {
			fCheckElements.remove(e.getElement());
		}		
		checkStateChanged();
	}