Permalink Tweaks 2 (#2766)

* Missing changelog.

* Parse bare room aliases as permalinks.

Update the SDK.

* Fix tapping the same permalink twice.

Add a test.

Don't clear the focussed item when reaching the bottom of the timeline.

* Make sure sending a message returns to live.

ElementX/Sources/Other/AccessibilityIdentifiers.swift

@@ -144,6 +144,7 @@ enum A11yIdentifiers {
         let attachmentPickerTextFormatting = "room-attachment_picker_text_formatting"
         let timelineItemActionMenu = "room-timeline_item_action_menu"
         let joinCall = "room-join_call"
+        let scrollToBottom = "room-scroll_to_bottom"
 
         let composerToolbar = ComposerToolbar()
 

ElementX/Sources/Other/HTMLParsing/AttributedStringBuilder.swift

@@ -218,6 +218,16 @@ struct AttributedStringBuilder: AttributedStringBuilderProtocol {
             return TextParsingMatch(type: .userID(identifier: identifier), range: match.range)
         }
         
+        matches.append(contentsOf: MatrixEntityRegex.roomAliasRegex.matches(in: string, options: []).compactMap { match in
+            guard let matchRange = Range(match.range, in: string) else {
+                return nil
+            }
+            
+            let alias = String(string[matchRange])
+            
+            return TextParsingMatch(type: .roomAlias(alias: alias), range: match.range)
+        })
+        
         matches.append(contentsOf: MatrixEntityRegex.linkRegex.matches(in: string, options: []).compactMap { match in
             guard let matchRange = Range(match.range, in: string) else {
                 return nil
@@ -257,6 +267,10 @@ struct AttributedStringBuilder: AttributedStringBuilderProtocol {
             switch match.type {
             case .atRoom:
                 attributedString.addAttribute(.MatrixAllUsersMention, value: true, range: match.range)
+            case .roomAlias(let alias):
+                if let url = try? matrixToRoomAliasPermalink(roomAlias: alias) {
+                    attributedString.addAttribute(.link, value: url, range: match.range)
+                }
             case .userID, .link:
                 if let url = match.link {
                     attributedString.addAttribute(.link, value: url, range: match.range)
@@ -363,6 +377,7 @@ protocol MentionBuilderProtocol {
 private struct TextParsingMatch {
     enum MatchType {
         case userID(identifier: String)
+        case roomAlias(alias: String)
         case link(urlString: String)
         case atRoom
     }

ElementX/Sources/Other/MatrixEntityRegex.swift

@@ -20,15 +20,18 @@ import MatrixRustSDK
 // https://spec.matrix.org/latest/appendices/#identifier-grammar
 enum MatrixEntityRegex: String {
     case homeserver
-    case userId
+    case userID
+    case roomAlias
     case allUsers
     
     var rawValue: String {
         switch self {
         case .homeserver:
             return "[A-Z0-9]+((\\.|\\-)[A-Z0-9]+){0,}(:[0-9]{2,5})?"
-        case .userId:
+        case .userID:
             return "@[\\x21-\\x39\\x3B-\\x7F]+:" + MatrixEntityRegex.homeserver.rawValue
+        case .roomAlias:
+            return "#[A-Z0-9._%#@=+-]+:" + MatrixEntityRegex.homeserver.rawValue
         case .allUsers:
             return PillConstants.atRoom
         }
@@ -36,7 +39,8 @@ enum MatrixEntityRegex: String {
     
     // swiftlint:disable force_try
     static var homeserverRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.homeserver.rawValue, options: .caseInsensitive)
-    static var userIdentifierRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.userId.rawValue, options: .caseInsensitive)
+    static var userIdentifierRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.userID.rawValue, options: .caseInsensitive)
+    static var roomAliasRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.roomAlias.rawValue, options: .caseInsensitive)
     static var allUsersRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.allUsers.rawValue)
     static var linkRegex = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
     // swiftlint:enable force_try
@@ -57,6 +61,14 @@ enum MatrixEntityRegex: String {
         return match.range.length == identifier.count
     }
     
+    static func isMatrixRoomAlias(_ alias: String) -> Bool {
+        guard let match = roomAliasRegex.firstMatch(in: alias) else {
+            return false
+        }
+        
+        return match.range.length == alias.count
+    }
+    
     static func containsMatrixAllUsers(_ string: String) -> Bool {
         guard allUsersRegex.firstMatch(in: string) != nil else {
             return false