1 Drag folder A to the tracklist - see Change Directory is performed
2 [EDIT:] CTRL+drag folder B to the tracklist - see Add Directory is performed, and Current Directory is set to folder B
3 Drag folder B to the tracklist
Expected: Change directory
Observed: Add Directory! I.e. folder A remains loaded!
I recall also other problems that arise when the Current Directory does not contain all loaded tracks. Perhaps it would be better for Current Directory to be set to null when the tracklist is mixed.