Follow-up Comment #5, bug #17059 (project gnustep): For the xlib backend this is a well known limitation. There was some mail exchange a while ago on it. As far as I remember the solutution was as simple as to extend the switch statement on bits_per_sample in _bitmap_combine_alpha to handle 16 bits correctly. The code below this was never planed to handle this case, but looks like it is capable of doing so. You should give this a try and come up with a nice patch :-)
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