SWT API like Control.getBackground() does not allocate a new native
resource that needs to be dispose()d by the caller (the
Color.win32_new() javadoc could be misinterpreted to imply otherwise).
Such implementations may return a new Color object that wraps the native
resource, but a new native resource is not allocated. You should never
dispose() a graphic resource unless you originally created it with "new
...". I think that you can get away with over-dispose()ing a Color on
win32 due to an implementation detail, but doing this on other platforms
or with other types of graphics resources will cause problems.