For #11502: Make sure to always process root titles for parent folders during edit

This also switches to a simpler bookmarks query API ('getBookmark') which doesn't fetch
children. We don't need 'children' for this dialog, and so don't need to do the extra work.

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

@@ -71,14 +71,22 @@ class EditBookmarkFragment : Fragment(R.layout.fragment_edit_bookmark) {
         viewLifecycleOwner.lifecycleScope.launch(Main) {
             val context = requireContext()
             val bookmarkNodeBeforeReload = bookmarkNode
-
-            withContext(IO) {
             val bookmarksStorage = context.components.core.bookmarksStorage
-                bookmarkNode = bookmarksStorage.getTree(args.guidToEdit)
-                bookmarkParent = sharedViewModel.selectedFolder
-                    ?: bookmarkNode?.parentGuid
-                        ?.let { bookmarksStorage.getTree(it) }
-                        ?.let { DesktopFolders(context, showMobileRoot = true).withRootTitle(it) }
+
+            bookmarkNode = withContext(IO) {
+                bookmarksStorage.getBookmark(args.guidToEdit)
+            }
+
+            bookmarkParent = withContext(IO) {
+                // Use user-selected parent folder if it's set, or node's current parent otherwise.
+                if (sharedViewModel.selectedFolder != null) {
+                    sharedViewModel.selectedFolder
+                } else {
+                    bookmarkNode?.parentGuid?.let { bookmarksStorage.getBookmark(it) }
+                }?.let {
+                    // No-op for non-root nodes, and copies a node with a friendly title otherwise.
+                    DesktopFolders(context, showMobileRoot = true).withRootTitle(it)
+                }
             }
 
             when (bookmarkNode?.type) {
@@ -101,6 +109,8 @@ class EditBookmarkFragment : Fragment(R.layout.fragment_edit_bookmark) {
 
             bookmarkParent?.let { node ->
                 bookmarkParentFolderSelector.text = node.title
+            }
+
             bookmarkParentFolderSelector.setOnClickListener {
                 sharedViewModel.selectedFolder = null
                 nav(
@@ -116,7 +126,6 @@ class EditBookmarkFragment : Fragment(R.layout.fragment_edit_bookmark) {
                         )
                 )
             }
-            }
 
             view.bookmarkNameEdit.apply {
                 requestFocus()