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
* @param color
	 *            the color to use as the background color
	 * @param control
	 *            the control whose color is to be changed
	 * @see PopupDialog#getBackgroundColorExclusions()
	 */
	protected void applyBackgroundColor(Color color, Control control) {
		applyBackgroundColor(color, control, getBackgroundColorExclusions());
	}
	/**
	 * Return a list of controls which should never have their foreground color
	 * reset. Subclasses may extend this method, but should always call
	 * <code>super.getForegroundColorExclusions</code> to aggregate the list.
	 * 
	 * 
	 * @return the List of controls
	 */
	protected List getForegroundColorExclusions() {
		List list = new ArrayList(3);
		if (infoLabel != null) {
			list.add(infoLabel);
		}
		if (titleSeparator != null) {
			list.add(titleSeparator);
		}
		if (infoSeparator != null) {
			list.add(infoSeparator);
		}
		return list;
	}