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 this page's button bar. For each button a subclass contributes,
	 * it must also increase the parent's grid layout number of columns
	 * by one; that is,
	 * <pre>
	 * ((GridLayout) parent.getLayout()).numColumns++);
	 * </pre>
	 * </p>
	 *
	 * @param parent the button bar
	 */
	protected void contributeButtons(Composite parent) {
	}
	/**
	 * Creates and returns the SWT control for the customized body 
	 * of this preference page under the given parent composite.
	 * <p>
	 * This framework method must be implemented by concrete subclasses. Any
	 * subclass returning a <code>Composite</code> object whose <code>Layout</code>
	 * has default margins (for example, a <code>GridLayout</code>) are expected to
	 * set the margins of this <code>Layout</code> to 0 pixels. 
	 * </p>
	 *
	 * @param parent the parent composite
	 * @return the new control
	 */
	protected abstract Control createContents(Composite parent);
	/**
	 * The <code>PreferencePage</code> implementation of this 
	 * <code>IDialogPage</code> method creates a description label
	 * and button bar for the page. It calls <code>createContents</code>