Comment 2 for bug 235382

I also tried it on two linux PCs, PC_A is installed Ubuntu, and PC_B is installed Fedora, the behavior is different:
PC_A:
1. change one image file 1.jpg to test, still can be added into wallpaper list, work correctly.
2. change one image file 1.jpg to test.txt, cannot be added into wallpaper list, doesn't work.

PC_B:
1. change one image file 1.jpg to test, still can be added into wallpaper list, work correctly.
2. change one image file 1.jpg to test.txt, still can be added into wallpaper list, work correctly.

It's better if our MID device can work well as PC_B which is installed Fedora.
Anyways, it's a wishlist feature request which may spend more time loading image files especially when there are lots of photos. Close it currently.