Description of problem:
tumbler generates no thumbnail if selinux is in Enforcing mode

Version-Release number of selected component (if applicable):
tumbler-0.1.31-2.fc23.x86_64
selinux-policy-3.13.1-158.4.fc23.noarch

How reproducible:
Happens on my primary machine, almost fresh installation of Fedora 23 Xfce spin

Steps to Reproduce:
1. set selinux to Permissive mode (setenforce 0)
2. reboot or similar
3. from terminal create a new folder, wget some image to that folder
4. open the folder in Thunar
5. observe the result
6. open desktop settings
7. observe the wallpaper settings
8. set selinux to Enforcing mode (setenforce 1)
9. reboot or similar
10. from terminal create a new (different) folder, wget some (different) image to that folder
11. open the folder in Thunar
12. observe the result
13. open desktop settings
14. observe the wallpaper settings

Actual results:
During Permissive mode, Thunar and Wallpaper settings generates image previews
During Enforcing mode, Thunar does not generate/display thumbnails, Wallpaper setting is unusable

See screenshots I will attach.

Expected results:
During both selinux modes, Thunar and Wallpaper settings generates image previews.