src/vs/workbench/contrib/output/common/outputChannelModel.ts/FileOutputChannelModel/update
class FileOutputChannelModel:	update(mode: OutputChannelUpdateMode, till: number | undefined, immediate: boolean): void {
		const loadModelPromise: Promise<any> = this.loadModelPromise ? this.loadModelPromise : Promise.resolve();
		loadModelPromise.then(() => this.doUpdate(mode, till, immediate));
	}