[BUG] Annoying bug on function 'Update library'

I've already talked about it but I think a dedicated topic might be more useful.

In the Library part, the Update function has some bugs:

• The more files you have, the slower the scanning of a library is (it's exponential). If you have 2 libraries, one with 100 files, the other with 30000, the scan of the one with 100 will be slowed down because of the one with 30000. If you delete the library of 30000 files, the scan of the one with 100 becomes fast !
• A deleted album remains...

[BUG] Annoying bug on function 'Update library'