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/PreferencePage.java
* to create the custom contents of the page.
	 * <p>
	 * If a subclass that overrides this method creates a <code>Composite</code>
	 * that has a layout with default margins (for example, a <code>GridLayout</code>)
	 * it is expected to set the margins of this <code>Layout</code> to 0 pixels.
	 */
	public void createControl(Composite parent) {
		GridData gd;
		Composite content = new Composite(parent, SWT.NULL);
		setControl(content);
		Font font = parent.getFont();
		GridLayout layout = new GridLayout();
		layout.marginWidth = 0;
		layout.marginHeight = 0;
		content.setLayout(layout);
		content.setFont(font);
		
		initializeDialogUnits(content);
		descriptionLabel = createDescriptionLabel(content);
		if (descriptionLabel != null) {
			descriptionLabel.setLayoutData(
				new GridData(GridData.FILL_HORIZONTAL));
		}
		body = createContents(content);
		if (body != null)
			
			body.setLayoutData(new GridData(GridData.FILL_BOTH));
		Composite buttonBar = new Composite(content, SWT.NULL);
		layout = new GridLayout();
		layout.numColumns = 0;