It looks like Pinta is using GTK+ 2, which at least according to https://wiki.archlinux.org/index.php/HiDPI#GTK.2B_2 does not support scaling UI components.
It looks like Pinta is using GTK+ 2, which at least according to https:/ /wiki.archlinux .org/index. php/HiDPI# GTK.2B_ 2 does not support scaling UI components.