fix: clear cached driver instance after detaching (#2753)

Author: eglitise

app/common/renderer/actions/SessionInspector.js

@@ -308,6 +308,7 @@ export function quitSession({reason, manualQuit = true, detachOnly = false} = {}
       await applyAction(dispatch, getState);
     }
     dispatch({type: QUIT_SESSION_DONE});
+    InspectorDriver.clearInstance(); // clear the 'cached' driver instance
     if (!manualQuit) {
       showError(new Error(reason || i18n.t('Session has been terminated')), {secs: 0});
     }

app/common/renderer/lib/appium/inspector-driver.js

@@ -42,6 +42,10 @@ export default class InspectorDriver {
     return _instance;
   }
 
+  static clearInstance() {
+    _instance = null;
+  }
+
   constructor(driver) {
     this.driver = driver;
     this.elementCache = {};
@@ -67,10 +71,7 @@ export default class InspectorDriver {
         await this.driver.deleteSession();
       } catch {}
 
-      _instance = null;
-
-      // when we've quit the session, there's no source/screenshot to send
-      // back
+      // when we've quit the session, there's no source/screenshot to send back
       return {
         source: null,
         screenshot: null,