Currently in Nautilus if one right-clicks on an image file and clicks "Set As Wallpaper" it will set that image as the current wallpaper after moving it to the Wallpapers folder in ~/Pictures. This is all very well, however if I then set another image as my wallpaper, and then come back and want to set the one I previously set as my wallpaper, if I right-click on it and choose the option to set it it will tell me that an image with the same name already exists in the Wallpapers folder and it asks me if I want to replace it.

Now this is something I really would not expect of it, I would expect Nautilus to deal with such a situation more cleanly.

So my suggestion would be, once one selects an image to be the wallpaper it is moved to the Wallpapers folder but also renamed so that the issue described above does not occur. Another thing which may be good would be for it to check if there is currently a file in the Wallpapers folder which in terms of contents is identical to the one you are trying to set, then it could just set the one currently in the Wallpapers folder as the wallpaper.

As the wallpaper files will now probably have strange names (well, each one could be called something like "wallpaper-1", and the number would increment each time), it may also be a good thing to not have the Wallpapers folder in ~/Pictures where it currently is and instead have it somewhere more internal and hidden away to avoid causing confusion, and anyway, if all this is implemented then there will be no need for it to be so visible. But this bit is just a suggestion, the main point of this report is to have a more clean way of dealing with duplicate files, or at least settings ones that have the same name as a previously set file located in Wallpapers.

I initially made this request here: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1612295 But thought I should also do so upstream.