I'm stumbling onto more pieces as well:
The patch from the kdedevs:
Bug:
https://bugs.kde.org/show_bug.cgi?id=266319
link to patch:
https://bugs.kde.org/attachment.cgi?id=57257
(attached to message as well)
This may handle the gwenview problem or provide an excellent
Go-By to create our own.
We will need to see if this applies and if it is
fixed in TDE as well (png_read_update_info calls
png_read_start_image) pngloader.cpp.
https://bugs.kde.org/show_bug.cgi?id=296305
Good find!
Side note: Why every time the libpng people push a Dot Zero release everybody in the
entire free/libre software world has to play Keystone Kops to fix their changes?
Darrell