When trying to drag a message from Inbox to a folder, it auto opens the panel for a split view. At this point you are unable to click on the + to split the view, but more importantly, this annoying action also makes it near impossible to drag the message into the folder. It's like playing dodgeball while you try to move the mouse over the folder name while also attempting not to trigger the split view to open the panel again. Awful "predictive" action for that panel.