domfe wrote:Can I have more information on this bug?
The has been a feature of SWT since the very beginning. I think it is their subtle way of telling you never to use a null layout (which you never should).
If you have general questions about SWT itself, I would recommend asking them in the Eclipse SWT newsgroup.
domfe wrote:How can the Designer layout correctly the containers?
Designer can do anything it wants in its own design view since that is just a simulation.