[fenix] For https://github.com/mozilla-mobile/fenix/issues/1951: Bookmarks library pane displays everything from root down (https://github.com/mozilla-mobile/fenix/pull/2135)

app/src/main/java/org/mozilla/fenix/library/LibraryFragment.kt

@@ -54,10 +54,12 @@ class LibraryFragment : Fragment() {
             )
         )
 
-        libraryBookmarks.setOnClickListener(Navigation.createNavigateOnClickListener(
-            LibraryFragmentDirections.actionLibraryFragmentToBookmarksFragment(BookmarkRoot.Root.id).actionId,
-            BookmarkFragmentArgs(BookmarkRoot.Root.id).toBundle()
-        ))
+        libraryBookmarks.setOnClickListener(
+            Navigation.createNavigateOnClickListener(
+                LibraryFragmentDirections.actionLibraryFragmentToBookmarksFragment(BookmarkRoot.Mobile.id).actionId,
+                BookmarkFragmentArgs(BookmarkRoot.Mobile.id).toBundle()
+            )
+        )
     }
 
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {

app/src/main/java/org/mozilla/fenix/library/bookmarks/BookmarkFragment.kt

@@ -89,7 +89,7 @@ class BookmarkFragment : Fragment(), CoroutineScope, BackHandler, AccountObserve
         checkIfSignedIn()
 
         navigation.addOnDestinationChangedListener(onDestinationChangedListener)
-        val currentGuid = BookmarkFragmentArgs.fromBundle(arguments!!).currentRoot.ifEmpty { BookmarkRoot.Root.id }
+        val currentGuid = BookmarkFragmentArgs.fromBundle(arguments!!).currentRoot.ifEmpty { BookmarkRoot.Mobile.id }
 
         launch(IO) {
             currentRoot = requireComponents.core.bookmarksStorage.getTree(currentGuid) as BookmarkNode

app/src/main/java/org/mozilla/fenix/library/bookmarks/BookmarkUIView.kt

@@ -111,8 +111,9 @@ class BookmarkUIView(
 
     private fun setTitle(root: BookmarkNode?) {
         (activity as? AppCompatActivity)?.title =
-            if (root?.title in setOf(
-                    "root",
+            if (root?.guid in setOf(
+                    BookmarkRoot.Mobile.id,
+                    BookmarkRoot.Root.id,
                     null
                 )
             ) context.getString(R.string.library_bookmarks) else root!!.title