微信公众号切换第二次切换webview之后定位元素失败

* **问题描述**:
进入微信公众号之后切换webview，并点击元素跳转到下一个页面，再次切换webview并点击页面元素的时候提示Argument was an invalid selector
* **Macaca Version**:
2.1.2
* **代码**:
public class Test4 {

BaseMacacaClient driver = new BaseMacacaClient();

@BeforeMethod
public void setUp() throws Exception {
JSONObject porps = new JSONObject();
porps.put("autoAcceptAlerts", true);
porps.put("platformName", Config.ADR_PLATFORM_NAME);
porps.put("udid", "192.168.100.117:15361");
porps.put("deviceName", "STF");
driver.setCurPlatform(PlatformType.ANDROID);
porps.put("reuse", Config.REUSE);
porps.put("package", "com.tencent.mm");
porps.put("activity", "com.tencent.mm.ui.LauncherUI");
// 关键是加上这段
porps.put("androidProcess", "com.tencent.mm:tools");

JSONObject desiredCapabilities = new JSONObject();
desiredCapabilities.put("desiredCapabilities", porps);
driver.initDriver(desiredCapabilities);
}

@Test
public void test_case_1() throws Exception {

driver.sleep(2000);
driver.elementByName("内部运营001").click();
driver.elementByName("我的服务").click();
driver.elementByName("个人主页").click();
Thread.sleep(5000);
// driver.switchFromNativeToWebView();
System.out.println(driver.contexts);
switchToWebView(driver);
Thread.sleep(2000);
System.out.println("=========================="+driver.currentContext());
driver.elementByName("全部").click();
Thread.sleep(2000);
System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"+driver.currentContext());
driver.switchFromeWebviewToNative();
Thread.sleep(2000);
System.out.println("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"+driver.currentContext());
switchToWebView(driver);
Thread.sleep(2000);
System.out.println("###############################"+driver.currentContext());
driver.elementByName("已订业务").click();
}

public static MacacaClient switchToWebView(MacacaClient driver) throws Exception {
JSONArray contexts = driver.contexts();
return driver.context(contexts.get(contexts.size() - 1).toString());
}

@AfterMethod
public void tearDown() throws Exception {

Thread.sleep(5000);
driver.quit();
}

}

* **日志**:
>> UIAutomatorWD http server ready
>> macaca-android.js:303:10 [master] pid:12776 start app with: {"package":"com.tencent.mm","activity":"","androidProcess":"com.tencent.mm:tools"}
>> responseHandler.js:49:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:39:57]: {"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87","status":0,"value":"{\"reuse\":\"3\",\"package\":\"com.tencent.mm\",\"activity\":\"com.tencent.mm.ui.LauncherUI\",\"androidProcess\":\"com.tencent.mm:tools\",\"platformName\":\"Android\",\"udid\":\"192.168.100.117:15361\",\"deviceName\":\"STF\",\"autoAcceptAlerts\":true}"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:39:59]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element, jsonBody: {"using":"name","value":"内部运营001"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":null}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element:POST with body: {"using":"name","value":"内部运营001"}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"value":{"ELEMENT":"1"},"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:00]: {"status":0,"value":"{\"ELEMENT\":\"1\"}","sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:00]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element/1/click, jsonBody: {}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":":sessionId"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element/1/click:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element/1/click:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:01]: {"status":0,"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:01]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element, jsonBody: {"using":"name","value":"我的服务"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":":sessionId"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element:POST with body: {"using":"name","value":"我的服务"}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"value":{"ELEMENT":"1"},"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:03]: {"status":0,"value":"{\"ELEMENT\":\"1\"}","sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:03]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element/1/click, jsonBody: {}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":":sessionId"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element/1/click:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element/1/click:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:04]: {"status":0,"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:04]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element, jsonBody: {"using":"name","value":"个人主页"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":":sessionId"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element:POST with body: {"using":"name","value":"个人主页"}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"value":{"ELEMENT":"1"},"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:05]: {"status":0,"value":"{\"ELEMENT\":\"1\"}","sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:05]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element/1/click, jsonBody: {}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":":sessionId"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element/1/click:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element/1/click:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:06]: {"status":0,"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:11]: method: GET url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/contexts, jsonBody: {}
Could not get the webview version!
>> No webview version found from adb shell!
>> responseHandler.js:49:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:12]: {"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87","status":0,"value":"[\"NATIVE_APP\"]"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:12]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/context, jsonBody: {"name":"NATIVE_APP"}
>> responseHandler.js:49:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:12]: {"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87","status":0,"value":null}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:14]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element, jsonBody: {"using":"name","value":"全部"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":13,"value":"An unknown server-side error occurred while processing the command.","sessionId":":sessionId"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element:POST with body: {"using":"name","value":"全部"}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"value":{"ELEMENT":"1"},"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:15]: {"status":0,"value":"{\"ELEMENT\":\"1\"}","sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:15]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element/1/click, jsonBody: {}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":13,"value":"An unknown server-side error occurred while processing the command.","sessionId":":sessionId"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element/1/click:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element/1/click:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:16]: {"status":0,"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:18]: method: GET url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/contexts, jsonBody: {}
Could not get the webview version!
>> No webview version found from adb shell!
>> responseHandler.js:49:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:19]: {"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87","status":0,"value":"[\"NATIVE_APP\"]"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:19]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/context, jsonBody: {"name":"NATIVE_APP"}
>> responseHandler.js:49:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:19]: {"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87","status":0,"value":null}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:21]: method: GET url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/contexts, jsonBody: {}
Could not get the webview version!
>> No webview version found from adb shell!
>> responseHandler.js:49:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:22]: {"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87","status":0,"value":"[\"NATIVE_APP\"]"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:22]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/context, jsonBody: {"name":"NATIVE_APP"}
>> responseHandler.js:49:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:22]: {"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87","status":0,"value":null}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:24]: method: POST url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element, jsonBody: {"using":"name","value":"已订业务"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/:sessionId/accept_alert:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/accept_alert:POST with body: {}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":0,"sessionId":":sessionId"}
>> proxy.js:55:14 [master] pid:12776 Proxy: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87/element:POST to http://127.0.0.1:9009/wd/hub/session/:sessionId/element:POST with body: {"using":"name","value":"已订业务"}
>> proxy.js:85:20 [master] pid:12776 Got response with status 200: {"status":32,"value":"Argument was an invalid selector (e.g. XPath/CSS).","sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> session.js:120:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:26]: {"status":32,"value":"\"Argument was an invalid selector (e.g. XPath/CSS).\"","sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87"}
>> responseHandler.js:11:12 [master] pid:12776 Recieve HTTP Request from Client[2018-03-30 10:40:31]: method: DELETE url: /wd/hub/session/de53ed02-6892-4746-9b17-7b94547c0c87, jsonBody: {}
>> session.js:91:12 [master] pid:12776 Delete session, sessionId: de53ed02-6892-4746-9b17-7b94547c0c87
>> responseHandler.js:49:14 [master] pid:12776 Send HTTP Respone to Client[2018-03-30 10:40:31]: {"sessionId":"de53ed02-6892-4746-9b17-7b94547c0c87","status":0}

Start with the Java reproduction around switchToWebView, switchFromeWebviewToNative, contexts, and the second elementByName call. Trace the contexts response and selector requests through macaca-android.js:303:10, proxy.js, responseHandler.js, and session.js. Done means the reproduced second WebView switch can locate and click 已订业务 without the selector error.

Written by the indexing model from the issue text.