Bug 220767 [Dialogs] PopupDialog's HOVER_SHELLSTYLE should use SWT.TOOL
3.3.x and 3.4 M5. The SWT.TOOL flag should be used to create hover style shells, hence the PopupDialog's HOVER_SHELLSTYLE should use SWT.TOOL.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/PopupDialog.java
* the user has changed its value. Subclasses may override this method.
	 * 
	 * @return <code>true</code> if the dialog's location will be persisted,
	 *         <code>false</code> if it will not.
	 * 
	 * @see #getPersistSize()
	 * @since 3.4
	 */
	protected boolean getPersistLocation() {
		return persistLocation;
	}
	/**
	 * Return a boolean indicating whether this dialog will persist its size.
	 * This value is initially set in the dialog's constructor, but can be
	 * modified if the persist size action is shown on the menu and the user has
	 * changed its value. Subclasses may override this method.
	 * 
	 * @return <code>true</code> if the dialog's size will be persisted,
	 *         <code>false</code> if it will not.
	 * 
	 * @see #getPersistLocation()
	 * @since 3.4
	 */
	protected boolean getPersistSize() {
		return persistSize;
	}
	/**
	 * Opens this window, creating it first if it has not yet been created.
	 * <p>
	 * This method is reimplemented for special configuration of PopupDialogs.