It is currently possible to sort the Album treeview by category, however the tree itself does not give any clue to what category a specific treenode belongs to. Thus it is really hard to understand how the tree is actually sorted when "sort by category" is enabled.

Would it be possible to visualize category belonging in the Album Tree list? 
- Maybe by text color? 
- Or adding category name after album name, i.e "Album name goes here (numberOfEntries) [CategoryName]"
- Or by adding intermediate treenodes representing the catorgy if "sort by category" is enabled, i.e

+ Parent_Album
--- + Category 1
--- --- Album 1
--- --- Album 2
--- + Category 2
--- --- Album 1
--- --- Album 2