src/vs/editor/browser/viewParts/minimap/minimap.ts/ContiguousLineMap/get
class ContiguousLineMap:	public get(lineNumber: number): T {
		if (lineNumber < this._startLineNumber || lineNumber > this._endLineNumber) {
			return this._defaultValue;
		}
		return this._values[lineNumber - this._startLineNumber];
	}