Fixed a bug that prevented the mentions to be shown as plain text in the room list cell (#1835)

* fix a bug that made the room list not render mentions as plain text

* better naming

ElementX/Sources/Other/Pills/PlainMentionBuilder.swift

@@ -0,0 +1,24 @@
+//
+// Copyright 2023 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+// In the future we might use this to do some customisation in what is plain text used to represent mentions.
+struct PlainMentionBuilder: MentionBuilderProtocol {
+    func handleAllUsersMention(for attributedString: NSMutableAttributedString, in range: NSRange) { }
+    
+    func handleUserMention(for attributedString: NSMutableAttributedString, in range: NSRange, url: URL, userID: String) { }
+}