Show profile picture in conversation title view

Signal/src/Loki/Components/ConversationTitleView.swift

@@ -15,6 +15,15 @@ final class ConversationTitleView : UIView {
     }
     
     // MARK: Components
+    private lazy var profilePictureView: ProfilePictureView = {
+        let result = ProfilePictureView()
+        let size = Values.smallProfilePictureSize
+        result.set(.width, to: size)
+        result.set(.height, to: size)
+        result.size = size
+        return result
+    }()
+
     private lazy var titleLabel: UILabel = {
         let result = UILabel()
         result.textColor = Colors.text
@@ -37,6 +46,7 @@ final class ConversationTitleView : UIView {
         super.init(frame: CGRect.zero)
         setUpViewHierarchy()
         updateTitle()
+        updateProfilePicture()
         updateSubtitleForCurrentStatus()
         let notificationCenter = NotificationCenter.default
         notificationCenter.addObserver(self, selector: #selector(handleProfileChangedNotification(_:)), name: NSNotification.Name(rawValue: kNSNotificationName_OtherUsersProfileDidChange), object: nil)
@@ -56,11 +66,13 @@ final class ConversationTitleView : UIView {
     }
     
     private func setUpViewHierarchy() {
-        let stackView = UIStackView(arrangedSubviews: [ titleLabel, subtitleLabel ])
-        stackView.axis = .vertical
+        let labelStackView = UIStackView(arrangedSubviews: [ titleLabel, subtitleLabel ])
+        labelStackView.axis = .vertical
+        labelStackView.alignment = .leading
+        let stackView = UIStackView(arrangedSubviews: [ profilePictureView, labelStackView ])
+        stackView.axis = .horizontal
         stackView.alignment = .center
-        stackView.layoutMargins = UIEdgeInsets(top: 4, left: 8, bottom: 4, right: 0) // Compensate for settings button trailing margin
-        stackView.isLayoutMarginsRelativeArrangement = true
+        stackView.spacing = Values.smallSpacing
         addSubview(stackView)
         stackView.pin(to: self)
     }
@@ -88,11 +100,39 @@ final class ConversationTitleView : UIView {
         }
         titleLabel.text = title
     }
+
+    private func updateProfilePicture() {
+        if let thread = thread as? TSGroupThread {
+            if thread.name() == "Loki Public Chat" || thread.name() == "Session Public Chat" { // Override the profile picture for the Loki Public Chat and the Session Public Chat
+                profilePictureView.hexEncodedPublicKey = ""
+                profilePictureView.isRSSFeed = true
+            } else if let openGroupProfilePicture = thread.groupModel.groupImage { // An open group with a profile picture
+                profilePictureView.openGroupProfilePicture = openGroupProfilePicture
+                profilePictureView.isRSSFeed = false
+            } else if thread.groupModel.groupType == .openGroup || thread.groupModel.groupType == .rssFeed { // An open group without a profile picture or an RSS feed
+                profilePictureView.hexEncodedPublicKey = ""
+                profilePictureView.isRSSFeed = true
+            } else { // A closed group
+                var users = MentionsManager.userPublicKeyCache[thread.uniqueId!] ?? []
+                users.remove(getUserHexEncodedPublicKey())
+                let randomUsers = users.sorted().prefix(2) // Sort to provide a level of stability
+                profilePictureView.hexEncodedPublicKey = randomUsers.count >= 1 ? randomUsers[0] : ""
+                profilePictureView.additionalHexEncodedPublicKey = randomUsers.count >= 2 ? randomUsers[1] : ""
+                profilePictureView.isRSSFeed = false
+            }
+        } else { // A one-on-one chat
+            profilePictureView.hexEncodedPublicKey = thread.contactIdentifier()!
+            profilePictureView.additionalHexEncodedPublicKey = nil
+            profilePictureView.isRSSFeed = false
+        }
+        profilePictureView.update()
+    }
     
     @objc private func handleProfileChangedNotification(_ notification: Notification) {
         guard let hexEncodedPublicKey = notification.userInfo?[kNSNotificationKey_ProfileRecipientId] as? String, let thread = self.thread as? TSContactThread,
             hexEncodedPublicKey == thread.contactIdentifier() else { return }
         updateTitle()
+        updateProfilePicture()
     }
     
     @objc private func handleCalculatingPoWNotification(_ notification: Notification) {