src/vs/editor/browser/viewParts/minimap/minimap.ts/ContiguousLineMap/constructor
class ContiguousLineMap:	constructor(startLineNumber: number, endLineNumber: number, defaultValue: T) {
		this._startLineNumber = startLineNumber;
		this._endLineNumber = endLineNumber;
		this._defaultValue = defaultValue;
		this._values = [];
		for (let i = 0, count = this._endLineNumber - this._startLineNumber + 1; i < count; i++) {
			this._values[i] = defaultValue;
		}
	}