Bug 33488 [Preferences] [Help] F1 help should always give help about the selected page
build I20030227 - Window / Preferences - focus is in tree at left - F1 - it gives you help about the dialog, not the selected page - give the selected page focus - F1 - it gives you help about the page F1 should always give you help about the selected page. It should also give help about the dialog at the same time, if possible (e.g. a link for the page, and a link for the dialog).
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
* 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();
	}
	/**
	 * The preference dialog implementation of this <code>Dialog</code>
	 * framework method sends <code>performOk</code> to all pages of the 
	 * preference dialog, then calls <code>handleSave</code> on this dialog
	 * to save any state, and then calls <code>close</code> to close
	 * this dialog.
	 */
	protected void okPressed() {
		
		Iterator nodes =
			preferenceManager
				.getElements(PreferenceManager.PRE_ORDER)
				.iterator();
		while (nodes.hasNext()) {
			IPreferenceNode node = (IPreferenceNode) nodes.next();
			IPreferencePage page = node.getPage();
			if (page != null) {
				if (!page.performOk())