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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.
*** Bug 112960 has been marked as a duplicate of this bug. ***
As per http://wiki.eclipse.org/Platform_UI/Bug_Triage_Change_2009
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant.