src/vs/workbench/api/browser/mainThreadCustomEditors.ts/MainThreadCustomEditors/$onDidEdit
class MainThreadCustomEditors:	public async $onDidEdit(resourceComponents: UriComponents, viewType: string, editId: number, label: string | undefined): Promise<void> {
		const model = await this.getCustomEditorModel(resourceComponents, viewType);
		model.pushEdit(editId, label);
	}