Bug 95548 Editors page not sized properly on startup
build N20050517, open preferences dialog to editors page (under General). now close and open the dialog again and note that the dialog is too short.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
* 
	 * @param parent
	 *            the parent <code>Composite</code>.
	 * @return the <code>TreeViewer</code>.
	 * @since 3.0
	 */
	protected TreeViewer createTreeViewer(Composite parent) {
		final TreeViewer viewer = new TreeViewer(parent, SWT.NONE);
		addListeners(viewer);
		viewer.setLabelProvider(new PreferenceLabelProvider());
		viewer.setContentProvider(new PreferenceContentProvider());
		return viewer;
	}
	/**
	 * Add the listeners to the tree viewer.
	 * @param viewer
	 * 
	 * @since 3.1
	 */
	protected void addListeners(final TreeViewer viewer) {
		viewer.addPostSelectionChangedListener(new ISelectionChangedListener() {
			private void handleError() {
				try {
					
					
					
					viewer.removePostSelectionChangedListener(this);
					showPageFlippingAbortDialog();
					selectCurrentPageAgain();
					clearSelectedNode();