y, count = 0) {         let action = "move";         if (CaretBrowsing.selectionState !== CaretBrowsing.SelectionState.NONE) {             action = "extend";         }          for (let i = 0; i < count; i++) {             if (CaretBrowsing.selectionState === CaretBrowsing.SelectionState.LINE) {                 CaretBrowsing.