Hi,
grub-ext[1] was uploaded by "elamskoy" as a temp workaround for
some issue(s) in grub-gfx[2] package, but that person has since taken
over grub-gfx and orphaned grub-ext. Please delete grub-ext.
Regards.
Keshav
[1]https://aur.archlinux.org/packages.php?ID=53974
[2]https://aur.archlinux.org/packages.php?ID=2416