src/vs/editor/common/cursor/cursorColumnSelection.ts/ColumnSelection/columnSelectUp
class ColumnSelection:	public static columnSelectUp(config: CursorConfiguration, model: ICursorSimpleModel, prevColumnSelectData: IColumnSelectData, isPaged: boolean): IColumnSelectResult {
		const linesCount = isPaged ? config.pageSize : 1;
		const toViewLineNumber = Math.max(1, prevColumnSelectData.toViewLineNumber - linesCount);
		return this.columnSelect(config, model, prevColumnSelectData.fromViewLineNumber, prevColumnSelectData.fromViewVisualColumn, toViewLineNumber, prevColumnSelectData.toViewVisualColumn);
	}