Comment # 10 on bug 1183469 from Martin Wilck

You seem to be using hplip packages from HP. Please report problems with those
packages to HP, not to SUSE.

Please test with hplip-3.21.4-1.1.x86_64. This package doesn't require
python3-qt4.

$ rpm -qR hplip|grep qt
python3-qt5