src/vs/workbench/contrib/interactive/browser/interactive.contribution.ts/InteractiveInputContentProvider/provideTextContent
class InteractiveInputContentProvider:	async provideTextContent(resource: URI): Promise<ITextModel | null> {
		const existing = this._modelService.getModel(resource);
		if (existing) {
			return existing;
		}
		const result: ITextModel | null = this._modelService.createModel('', null, resource, false);
		return result;
	}