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
*            dialog settings for persisting the bounds are also specified.
	 *            If a menu action will be provided that allows the user to
	 *            control this feature and the user hasn't changed that setting,
	 *            then this flag is used as initial default for the menu.
	 * @param persistLocation
	 *            A boolean indicating whether the location should be persisted
	 *            upon close of the dialog. The location can only be persisted
	 *            if the dialog settings for persisting the bounds are also
	 *            specified. If a menu action will be provided that allows the
	 *            user to control this feature and the user hasn't changed that
	 *            setting, then this flag is used as initial default for the
	 *            menu. default for the menu until the user changed it.
	 * @param showDialogMenu
	 *            A boolean indicating whether a menu for moving and resizing
	 *            the popup should be provided.
	 * @param showPersistActions
	 *            A boolean indicating whether actions allowing the user to
	 *            control the persisting of the dialog bounds and location
	 *            should be shown in the dialog menu. This parameter has no
	 *            effect if <code>showDialogMenu</code> is <code>false</code>.
	 * @param titleText
	 *            Text to be shown in an upper title area, or <code>null</code>
	 *            if there is no title.
	 * @param infoText
	 *            Text to be shown in a lower info area, or <code>null</code>
	 *            if there is no info area.
	 * 
	 * @see PopupDialog#getDialogSettings()
	 * 
	 * @since 3.4