When the user clicks-and-drags on an email and moves it to a collapsed folder in the Folder Pane, the folder is expanded to allow the user navigate to a sub-folder. It would be nice if those folders then collapse again as per the state before the clicking-and-dragging of the email. This will prevent a few unnecessary mouse clicks if the user prefers to keep those folders always collapsed even after moving emails into them, or if the user accidentally navigated to them.