src/vs/editor/common/viewLayout/linesLayout.ts/EditorWhitespace/constructor
class EditorWhitespace:	constructor(id: string, afterLineNumber: number, ordinal: number, height: number, minWidth: number) {
		this.id = id;
		this.afterLineNumber = afterLineNumber;
		this.ordinal = ordinal;
		this.height = height;
		this.minWidth = minWidth;
		this.prefixSum = 0;
	}