src/vs/editor/contrib/linesOperations/moveLinesCommand.ts/MoveLinesCommand/buildIndentConverter
class MoveLinesCommand:	private buildIndentConverter(tabSize: number, indentSize: number, insertSpaces: boolean): IIndentConverter {
		return {
			shiftIndent: (indentation) => {
				return ShiftCommand.shiftIndent(indentation, indentation.length + 1, tabSize, indentSize, insertSpaces);
			},
			unshiftIndent: (indentation) => {
				return ShiftCommand.unshiftIndent(indentation, indentation.length + 1, tabSize, indentSize, insertSpaces);
			}
		};
	}