New feature for Xviewer wanted: Pin / Unpin images

[PurpleSmurf2]

If there is one function that is extremely helpful when editing large amounts of data, it is the function to pin files so that they are displayed at the top in bold font. Since I often work with many images and many images also have very cryptic file names, it would be very helpful if the Xviewer provided a button in the toolbar that allows me to pin an image. The Xviewer should also recognize whether a file has already been pinned and then offer the possibility to unpin the file.