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
}
/**
 * Closes this window, disposes its shell, and removes this
 * window from its window manager (if it has one).
 * <p>
 * This framework method may be extended (<code>super.close</code> must be 
 * called).
 * </p>
 *
 * @return <code>true</code> if the window is (or was already) closed, 
 *   and <code>false</code> if it is still open
 */
public boolean close() {
	if (shell == null || shell.isDisposed())
		return true;
	
	if (fontChangeListener != null) {
		JFaceResources.getFontRegistry().removeListener(fontChangeListener);
		fontChangeListener = null;
	}
	
	
	shell.dispose();
	shell = null;
	contents = null;
	if (windowManager != null) {
		windowManager.remove(this);
		windowManager = null;
	}
	return true;