Bug 49005 Preference page doesn't get enough space to draw itself
200312162000 There are cases where the preference dialog doesn't allocate enough space for a page to draw itself. The width of the page seems to be a few pixels short.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
* <p>
	 * The default implementation of this framework method
	 * calls <code>performHelp</code> on the currently active page.
	 * </p>
	 */
	protected void helpPressed() {
		if (currentPage != null) {
			currentPage.performHelp();
		}
	}
	/**
	 * Returns whether the current page is valid.
	 *
	 * @return <code>false</code> if the current page is not valid, or
	 *  or <code>true</code> if the current page is valid or there is
	 *  no current page
	*/
	protected boolean isCurrentPageValid() {
		if (currentPage == null)
			return true;
		else
			return currentPage.isValid();
	}
	/**
	 * @param control the <code>Control</code> to lay out.
	 * @since 3.0
	 */
	protected void layoutTreeAreaControl(Control control) {
		GridData gd = new GridData(GridData.FILL_VERTICAL);
		gd.widthHint = 150;