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/FontDescriptor.java
* @return a newly allocated Font (never null)
     * @throws DeviceResourceException if unable to allocate the Font
     */
    public abstract Font createFont(Device device) throws DeviceResourceException;
    
    /**
     * Deallocates anything that was allocated by createFont, given a font
     * that was allocated by an equal FontDescriptor.
     * 
     * @since 3.1 
     *
     * @param previouslyCreatedFont previously allocated font
     */
    public abstract void destroyFont(Font previouslyCreatedFont);
    
    /* (non-Javadoc)
     * @see org.eclipse.jface.resource.DeviceResourceDescriptor#create(org.eclipse.swt.graphics.Device)
     */
    public final Object createResource(Device device) throws DeviceResourceException {
        return createFont(device);
    }
    
    /* (non-Javadoc)
     * @see org.eclipse.jface.resource.DeviceResourceDescriptor#destroy(java.lang.Object)
     */
    public final void destroyResource(Object previouslyCreatedObject) {
        destroyFont((Font)previouslyCreatedObject);
    }
}