GIMP_PRINT_UNSTABLE_ANTI_PORTAL_WORKAROUND
found a less x86_64-specific way to get non-portal print dialog inside flatpak, opening merge request as requested
only tested on x86_64 linux
set environment variable GIMP_PRINT_UNSTABLE_ANTI_PORTAL_WORKAROUND=1
for non-portal gtk print dialog
this in opt-in because it might not work on all architectures or break when libgtk-3.so.0
code changes