[frostschutz]

pngshow is not supposed to change rotation, regardless what it's currently set to

(it does change it temporarily in the first call to detect rotation inversion behaviour of the device, then saves that state for future calls in /tmp/)

if you experience flips after using pngshow, maybe there's a leftover rotation hack meant to offset pickel's rotation issues somewhere?

pngshow has other issues though, it does not detect pixel offsets (e.g. 10px dead zone at the top for H2O); there doesn't seem to be a way to detect them other than hardcoding them for each device, or calling pickel and see what it does