src/vs/workbench/services/textMate/electron-sandbox/textMateService.ts/ModelWorkerTextMateTokenizer/_confirm
class ModelWorkerTextMateTokenizer:	private _confirm(versionId: number): void {
		while (this._pendingChanges.length > 0 && this._pendingChanges[0].versionId <= versionId) {
			this._pendingChanges.shift();
		}
	}