docs: more troubleshooting for Interact with dialogs managed by `com.…

…apple.springboard` (#2332)

docs/guides/troubleshooting.md

@@ -23,12 +23,17 @@ do not require such adjustment.
 
 XCUITest driver offers a few methods to handle them.
 
+- Start a session without `appium:app` nor `appium:bundleId`. Then XCUITest driver attempts to get the current active application. This requires you to start an application after a new session request with [`mobile: installApp`](../reference/execute-methods.md#mobile-installapp) to install an app if needed and [`mobile: launchApp`](../reference/execute-methods.md#mobile-launchapp)/[`mobile: activateApp`](../reference/execute-methods.md#mobile-activateapp), but it could automatically change the active application with `com.apple.springboard` or activated application on the top. (Note that the automatic detection could have a delay, thus each action could take more time.)
+    - When a permission alert exists on the top, it could select the `com.apple.springboard`
+    - When another application is on the top by accepting/denying the system alert, or [`mobile: activateApp`](../reference/execute-methods.md#mobile-activateapp), the application would be selected as an active application.
 - [`mobile: alert`](../reference/execute-methods.md#mobile-alert)
 - Enable `appium:autoAcceptAlerts`/`appium:autoDismissAlerts`, or interact with alerts via [User Prompts](https://www.w3.org/TR/webdriver1/#user-prompts) in WebDriver endpoints
     - e.g. `driver.switch_to.alert.accept` with the [Appium Ruby client](https://github.com/appium/ruby_lib_core)
     - It might be necessary to coordinate element selection via `acceptAlertButtonSelector`/`dismissAlertButtonSelector` settings in [Settings](../reference/settings.md)
 - Activate `com.apple.springboard` with [`mobile: activateApp`](../reference/execute-methods.md#mobile-activateapp) before interacting with dialogs
 
+[`mobile: activeAppInfo`](../reference/execute-methods.md#mobile-activateappinfo) helps to understand what application (bundleId) is considered as active for the XCUITest driver.
+
 ## Leftover Application Data on Real Devices
 
 There might be a situation where application data is present on the real device, even if the