This can be quite confusing and annoying when the Source location is far, far away from the Target - it gives the impression that the action has not actually been completed as the browser has reverted to what it looked like before you dragged-and-dropped.
Reproduce :
- Find the EIC preset Orchestral woodwinds -> Bassoon Solo -> Basoon solo legato
- drag this to folder: Guitars and Plucked -> Accoustic guitars
- the destination (Guitars and Plucked -> Accoustic guitars) should stay open and focused, but does not.