[bug #57335] PNG writing support appears to be broken

Follow-up Comment #2, bug #57335 (project gnustep):

[comment #1 comment #1:]
> the white bits where shown as black. Is this the bug you are reporting?

Yes.

> What you did is switch off this conversion.

Yes, but not as a "fix", I was hoping that it might give you a clue what's
going wrong.

> And for simple data where alpha is either 1 or 0 this results in correct
images.

I just tried with a half-transparent image (alpha 0.5) and to my surprise the
conversion is correct with current code.  But I'm afraid that "simple data" is
quite a common case, especially for icons.

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