Bug 369269

When working on an image with a similar name and prompted if you should replace the original file with the new one, after replying yes to it krita does not get rid of the file being replaced. And leaves behind what I can only describe as a ghost of the original. Usually the files will have n previews to them and their file type will always be followed by a ~ . For example: Sky.kra~    ,   sea.png~   , ground.jpeg~ 
The image is still accessible if the ~ is removed thus altering the file type. Therefore the image is not truly replaced, if only renamed in a way that it cant be opened.

Reproducible: Always

Steps to Reproduce:
1. Open a project and draw something on it.
2.Save file as .kra/.png/.jpeg
3.Alter the file and re-save it with the same name in order to be prompted if you wish to replace the original file with the one currently edited.
4. Click yes.
5. A second file with the same name but no preview is present along side with the recently altered file. Its name should have a ~ after the file type.

Actual Results:  
The replaced file in reality wasnt replaced, only renamed. And rather than be disposed of like most programs do when replacing images, the original image lingers behind unable to be opened unless the file type is altered. This leave behind a lot of unusable images on the long run.

Expected Results:  
Replace the original file with the new one and get rid of the old one.