Follow-up Comment #4, bug #28590 (project gnustep):
I wrote:
> To make things more weird, windows displayed during drag and drop show the
right colors.
Turns out that things are not weird at all: The dragging window uses
NSBackingStoreNonretained whereas the application windows use
NSBackingStoreBuffered (or maybe NSBackingStoreRetained). If I change the
backing store of the application windows to NSBackingStoreNonretained they
also display correctly, so I guess an unintended byte swap happens either when
writing to the backing store or when sending the backing store image to the
X-server.
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