You can do that in an MC Explorer - style way in Drives & Devices on the MC Tree. It updates the database too.
Oh. That's nice. Is there any reason why this doesn't work the same way in Library-Audio-DiskLocation? Why is there a distinction between these two ways of looking at folders in the filesystem? I'm sure there is a reason, but I feel that it would be more intuitive if they worked the same way. I guess this is what new users are for, stumbling over things others have gotten used to. But it could be more intuitive, no?
All rename functions in MC update the database. You must have done something wrong. Did you have the files imported before renaming?
Yes they are all imported.
Firstly, regarding the refresh issue: I did as you suggested, collapsing and expanding a branch. This does help a bit. Refreshing shows the new folders and no longer displays the deleted folders. But, since I'd selected that folder in the Tree View before running Rename, would it be possible to intelligently refresh that sub-branch after a Rename?
Secondly, it's more than a refresh issue. I copied a track by dragging it from the List pane into another folder in MC Explorer under Drives and Devices, and a quick check via Windows Explorer confirms the copy. MC Library however, does not automatically import the new track into that folder/album, unless I do a full update of the entire music collection using "Import Media". It's a hassle.
In both the refresh case and the copied track case, an option to update only a sub-branch of the music collection would help, I imagine this would be just right-click updating specific folders in the Tree View without going through the File-Library-ImportMedia hassle. This would also help if the user has done something outside MC with a third party program or Windows Explorer and only needs to update that folder or sub-branch.