Add userId in identity change warning banner #3678

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/core/UserId.kt

@@ -24,4 +24,9 @@ value class UserId(val value: String) : Serializable {
     }
 
     override fun toString(): String = value
+
+    val extractedDisplayName: String
+        get() = value
+            .removePrefix("@")
+            .substringBefore(":")
 }

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomMember.kt

@@ -51,6 +51,12 @@ data class RoomMember(
         isNameAmbiguous -> "$displayName ($userId)"
         else -> displayName
     }
+
+    val displayNameOrDefault: String
+        get() = when {
+            displayName == null -> userId.extractedDisplayName
+            else -> displayName
+        }
 }
 
 enum class RoomMembershipState {