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fixes #15216
According to https://tex.stackexchange.com/a/472462/66733 this bug is triggered in libpng when opening PNG files with Interlacing.
Find all interlaced PNGs in
plugins/Morpheus/images
:Remove interlacing:
mogrify -interlace none logo*
Remove execution rights (while we are at it):
chmod -x logo*
optimize the PNG losslessy:
optipng -o 9 logo*.png
Let's hope noone has a internet connection slow enough that they can watch single pixel appear while loading a 4KB image (who would benefit from interlacing).