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
*/
	private WindowManager windowManager;
	/**
	 * Window shell, or <code>null</code> if none.
	 */
	private Shell shell;
	/**
	 * Top level SWT control, or <code>null</code> if none
	 */
	private Control contents;
	
	/**
	 * Window return code; initially <code>OK</code>.
	 * 
	 * @see #setReturnCode
	 */
	private int returnCode = OK;
	/**
	 * <code>true</code> if the <code>open</code> method should
	 * not return until the window closes, and <code>false</code> if the
	 * <code>open</code> method should return immediately;
	 * initially <code>false</code> (non-blocking).
	 * 
	 * @see #setBlockOnOpen
	 */
	private boolean block = false;
	/**
	 * Internal class for informing this window when fonts change.
	 */
	private class FontChangeListener implements IPropertyChangeListener {