"By genre" list can not be updated

[andycor]

I don't know if it was posted before, I have made a quick search and haven't found nothing related to it.

Would be great if there was a way to update the "By genre" list. Sometimes, some files have a wrong genre inside, for instance "Rockkkk", and of course this genre is added to the list. After the tag is corrected in the file, this category remains in the "By Genre" list, and there is no way to remove it, even removing the files and the folder containing it.