Well I might not be understanding this completely as it relates to music, i am more of a video guy but in my experience with video and i would like music to act the same. An update simply detects a change, it does not remove anything, i have moved files, or altered a video files, changed the name of movies or tv episodes...ect..., and then update the library, after that you get two entries then, the new one and the old one, and hence you need to clean it before the old entry is removed, or you can click on it and remove it manually, or in my case i use this program to atuomate it.
I just dont get why music cannot do this, if you change the tag it will add the new cd/song entry, so you may have two entires, the old one that will need to be cleaned and the new updated one, then leave it to the user or this very program to clean it or remove it safely. I hoped updating a library would simply update the library like video, detecting new entries, not trying to remove it to.
In my case as someone who uses automation i leave it to this program to clean for me once a day.
RIght now im having to update my library manually out of fear libraries will be going to go missing.
And if people like the clean on update, let them add it to the advanced settings like video. Unfortunately for some us, their is no solution on the other side of the fence, i cant add a script as far as i know to not clean on update, were stuck with this making sure a single hard drive is always spinning, and then having to manually update it.
I would add this opinion to the trac ticket, but im worried im over stepping my bounds, jmarshall was incredibly nice to me, some other developers have the attitude this is the way it is and is going to be, so im happy he at least took the time to hear me, i dont want to step on any toes and make this a personal battle. Other users around the forum will need to chime in if they have an opinion, but im sure we will continue to see why is my music library going missing on the forum instead.
The discussion about this with jmarshall came up in 2011 about letting users manually add the clean argument if they want to music, so im doubting a change will happen.
http://forum.xbmc.org/showthread.php?tid=97430