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
*            bounds 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,
	 *            then the last known value of the user's setting will be used
	 *            instead of this flag.
	 * @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 size 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()
	 */
	public PopupDialog(Shell parent, int shellStyle, boolean takeFocusOnOpen,
			boolean persistBounds, boolean showDialogMenu,
			boolean showPersistActions, String titleText, String infoText) {
		this(parent, shellStyle, takeFocusOnOpen, persistBounds, persistBounds,
				showDialogMenu, showPersistActions, titleText, infoText);
	}
	/*
	 * (non-Javadoc)