I believe that is not useful to have a non-maintained and old development version for thunar... I think that they should be merged keeping the git version
https://aur.archlinux.org/packages/thunar-devel/ into https://aur.archlinux.org/packages/thunar-git And these are very old and patched version, the second one have a patch that now is upstream https://aur.archlinux.org/packages/thunar-notrash/ https://aur.archlinux.org/packages/thunar-smallicons/ Delete it Diego
