Bug 156747 Adopt Resource.getDevice() in the JFace resource managers
SWT has recently added a Resource.getDevice() method. This allows several improvements to be made to the JFace resource managers: 1. The (inefficient and complex) heuristics that detect a device by creating temporary resources can be removed. 2. The one-argument descriptor factories that don't take a Device can be made just as efficient as the two-argument versions. 3. The descriptor factory methods that take a Device can be deprecated, since the second argument is no longer required and the one-argument version is just as efficient.
bundles/org.eclipse.jface/src/org/eclipse/jface/resource/ArrayFontDescriptor.java
*/
    public ArrayFontDescriptor(Font originalFont) {
        this(originalFont.getFontData());
        this.originalFont = originalFont;
    }
    
    /**
     * Creates a font descriptor that describes the given font on the
     * specified device.
     * 
     * @param originalFont font to be described
     * @param originalDevice must be the same Device that was passed into
     * the font's constructor when it was first created.
     * 
     * @see FontDescriptor#createFrom(org.eclipse.swt.graphics.Font, org.eclipse.swt.graphics.Device)
     * @since 3.1
     */
     public ArrayFontDescriptor(Font originalFont, Device originalDevice) {
        this(originalFont);
        this.originalDevice = originalDevice;
    }
    
    /* (non-Javadoc)
     * @see org.eclipse.jface.resource.FontDescriptor#createFont(org.eclipse.swt.graphics.Device)
     */
    public Font createFont(Device device) {
        
        
        
        if (originalFont != null) {