Bug 58095 [Preferences] Selecting pref page moved dialog to other screen
When I move the preferences dialog to my secondary screen and change a prefpage, the entire dialog moves back to my primary screen and "hugs" the right border of the main screen.
bundles/org.eclipse.jface/src/org/eclipse/jface/window/Window.java
*/
public static Image[] getDefaultImages() {
	return (defaultImages == null ? new Image[0] : defaultImages);
}
/**
 * Returns the initial location to use for the shell.
 * The default implementation centers the shell horizontally 
 * (1/2 of the difference to the left and 1/2 to the right)
 * and vertically (1/3 above and 2/3 below) relative to the parent shell, 
 * or display bounds if there is no parent shell.
 *
 * @param initialSize the initial size of the shell, as returned by <code>getInitialSize</code>.
 * @return the initial location of the shell
 */
protected Point getInitialLocation(Point initialSize) {
	Composite parent = shell.getParent();
	
	Monitor monitor = shell.getDisplay().getPrimaryMonitor();
	if (parent != null) {
		monitor = parent.getMonitor();
	}
	
	Rectangle monitorBounds = monitor.getClientArea();
	Point centerPoint;
	if (parent != null) {
		centerPoint = Geometry.centerPoint(parent.getBounds());
	} else {
		centerPoint = Geometry.centerPoint(monitorBounds);
	}