src/vs/workbench/contrib/customEditor/common/customEditorModelManager.ts/CustomEditorModelManager/getAllModels
class CustomEditorModelManager:	public async getAllModels(resource: URI): Promise<ICustomEditorModel[]> {
		const keyStart = `${resource.toString()}@@@`;
		const models = [];
		for (const [key, entry] of this._references) {
			if (key.startsWith(keyStart) && entry.model) {
				models.push(await entry.model);
			}
		}
		return models;
	}