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
* @param parent the parent composite
	 * @return the new label
	 */
	protected Label createDescriptionLabel(Composite parent) {
		Label result = null;
		String description = getDescription();
		if (description != null) {
			result = new Label(parent, SWT.WRAP);
			result.setFont(parent.getFont());
			result.setText(description);
		}
		return result;
	}
	/**
	 * Computes the size needed by this page's UI control.
	 * <p>
	 * All pages should override this method and set the appropriate sizes
	 * of their widgets, and then call <code>super.doComputeSize</code>.
	 * </p>
	 *
	 * @return the size of the preference page encoded as
	 *   <code>new Point(width,height)</code>
	 */
	protected Point doComputeSize() {
		if (descriptionLabel != null && body != null) {
			Point size = body.computeSize(SWT.DEFAULT, SWT.DEFAULT, true);
			GridData gd = (GridData) descriptionLabel.getLayoutData();
			gd.widthHint = size.x;
			descriptionLabel.getParent().layout(true);
		}