1. make some tasks
2. go to batch edit
3. click "select all"
4. get confused because clicking "select all" gets rid of the "shift-click to select tasks" text and you didn't read it before clicking "select all"
5. drag tasks around the screen in your confusion
6. the tasks that you drag to a new priority change to the unselected style, but the number of selected tasks at the bottom doesn't change