Fix back button behavior for "App info" when launched by Launcher3.

Ensures the back stack is clean when opening the "App info" app from the launcher.

Bug: 10393223
Change-Id: Iad078ca37c4794a580f1b996f8324fef404e7462
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index c119999..b8a46d7 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2513,7 +2513,8 @@
         String packageName = componentName.getPackageName();
         Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
                 Uri.fromParts("package", packageName, null));
-        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK |
+                Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
         startActivitySafely(null, intent, "startApplicationDetailsActivity");
     }