src/vs/editor/common/model/textModel.ts/DidChangeDecorationsEmitter/recordLineAffectedByInjectedText
class DidChangeDecorationsEmitter:	public recordLineAffectedByInjectedText(lineNumber: number): void {
		if (!this._affectedInjectedTextLines) {
			this._affectedInjectedTextLines = new Set();
		}
		this._affectedInjectedTextLines.add(lineNumber);
	}