With the slider on, the panel stayed on whichever picture the pointer
last left over, and a new run did not change it, so a result could
finish behind the picture it was made from.
The panel now shows the result after every run and each time the
pointer leaves. The result is image_b, or image_a when the node feeding
image_b is upstream of the node feeding image_a; when both come out of
one subgraph the same check is made inside it. The A and B buttons
still hold one picture.
Settings > AusBoss > Image Compare > Rest on the result switches the
earlier behaviour back on.
ausboss
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