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The class org.eclipse.jface.resource.CompositeImageDescriptor does not support ImageData with the transparency type SWT.TRANSPARENCY_ALPHA (in its drawImage method). This is very annoying if you want to overlay e.g. two PNG files with alphas set. If have checked the sources of 3.1 and 3.0 releases.
*** This bug has been marked as a duplicate of 112614 ***