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Created attachment 8077 
xfce-about

Hi All,

$ rpm -qa xfce4-about
xfce4-about-4.13.4-20.fc29.x86_64

Pop up shows 4.12

This is known, I was told that development versions retain the previous stable version, as you can see:
https://git.xfce.org/xfce/libxfce4ui/commit/configure.ac.in?id=6344dd498d831fe8561906a7298ca63b6776cb7e