src/vs/workbench/contrib/output/common/outputChannelModel.ts/FileOutputChannelModel/clear
class FileOutputChannelModel:	override clear(till?: number): void {
		const loadModelPromise: Promise<any> = this.loadModelPromise ? this.loadModelPromise : Promise.resolve();
		loadModelPromise.then(() => {
			super.clear(till);
			this.update();
		});
	}