Issue #14225: Remove task when finishing ExternalAppBrowserActivity.

app/src/main/java/org/mozilla/fenix/customtabs/CustomTabsIntegration.kt

@@ -89,7 +89,7 @@ class CustomTabsIntegration(
         menuItemIndex = START_OF_MENU_ITEMS_INDEX,
         window = activity.window,
         shareListener = { onItemTapped.invoke(ToolbarMenu.Item.Share) },
-        closeListener = { activity.finish() }
+        closeListener = { activity.finishAndRemoveTask() }
     )
 
     override fun start() = feature.start()

app/src/main/java/org/mozilla/fenix/customtabs/ExternalAppBrowserActivity.kt

@@ -44,7 +44,7 @@ open class ExternalAppBrowserActivity : HomeActivity() {
         customTabSessionId: String?
     ): NavDirections? {
         if (customTabSessionId == null) {
-            finish()
+            finishAndRemoveTask()
             return null
         }
 

app/src/test/java/org/mozilla/fenix/customtabs/ExternalAppBrowserActivityTest.kt

@@ -58,10 +58,10 @@ class ExternalAppBrowserActivityTest {
 
         var directions = activity.getNavDirections(BrowserDirection.FromGlobal, "id")
         assertNotNull(directions)
-        verify(exactly = 0) { activity.finish() }
+        verify(exactly = 0) { activity.finishAndRemoveTask() }
 
         directions = activity.getNavDirections(BrowserDirection.FromGlobal, null)
         assertNull(directions)
-        verify { activity.finish() }
+        verify { activity.finishAndRemoveTask() }
     }
 }