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/RGBColorDescriptor.java
return other.color.equals(color) && other.originalColor == originalColor;
        }
        
        return false;
    }
    
    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    public int hashCode() {
        return color.hashCode();
    }
    
    /* (non-Javadoc)
     * @see org.eclipse.jface.resources.ColorDescriptor#createColor()
     */
    public Color createColor(Device device) {
        
        
        if (originalColor != null) { 
            
            
            if (originalDevice == null) {
                Color result = new Color(device, color);
                       
                
                 
                if (result.equals(originalColor)) {