Press ⌥⇧↑ (macOS), or Alt+Shift+Up Arrow (Windows/Linux), to move a line up. To move a line down use ⌥⇧↓ (macOS), or Alt+Shift+Down Arrow (Windows/Linux).
This shortcut does not factor in scope. You can move lines in and out of scope.
Move a line throughout your class
Press ⌥⇧↑ (macOS), or Alt+Shift+Up Arrow (Windows/Linux), to move a line up. To move a line down use ⌥⇧↓ (macOS), or Alt+Shift+Down Arrow (Windows/Linux).
This shortcut does not factor in scope. You can move lines in and out of scope.