Remove FLAG_ACTIVITY_NEW_DOCUMENT when starting the deep link

If an app starts a Settings deep link with FLAG_ACTIVITY_NEW_DOCUMENT,
FLAG_ACIVITY_NEW_TASK is auto-appended by frameworks which causes a
SecurityException on the 2-pane design because starting a new task on
the right pane is not allowed.

Deep links in the 2-pane design will clear the top activities, which has
the same UX behavior of setting FLAG_ACTIVITY_NEW_DOCUMENT, so we remove
the flag in this case.

Fix: 233917580
Test: start account page via Assistant
Change-Id: Idcbeb96e441592d48686f18f3433864f2c14832a
diff --git a/src/com/android/settings/homepage/SettingsHomepageActivity.java b/src/com/android/settings/homepage/SettingsHomepageActivity.java
index 3c72dd1..8e14c5a 100644
--- a/src/com/android/settings/homepage/SettingsHomepageActivity.java
+++ b/src/com/android/settings/homepage/SettingsHomepageActivity.java
@@ -436,7 +436,7 @@
         // To prevent launchDeepLinkIntentToRight again for configuration change.
         intent.setAction(null);
 
-        targetIntent.removeFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        targetIntent.removeFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_NEW_DOCUMENT);
         targetIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
 
         // Sender of intent may want to send intent extra data to the destination of targetIntent.