src/vs/editor/standalone/browser/standaloneCodeServiceImpl.ts/StandaloneCodeEditorServiceImpl/openCodeEditor
class StandaloneCodeEditorServiceImpl:	public openCodeEditor(input: IResourceEditorInput, source: ICodeEditor | null, sideBySide?: boolean): Promise<ICodeEditor | null> {
		if (!source) {
			return Promise.resolve(null);
		}

		return Promise.resolve(this.doOpenEditor(source, input));
	}