Fix user mentions not working when commands are disabled

CHANGELOG.md

@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### 🐞 Fixed
 - Fix swipe to reply enabled when quoting a message is disabled [#824](https://github.com/GetStream/stream-chat-swiftui/pull/824)
 - Fix mark unread action not removed when read events are disabled [#823](https://github.com/GetStream/stream-chat-swiftui/pull/823)
+- Fix user mentions not working when commands are disabled [#826](https://github.com/GetStream/stream-chat-swiftui/pull/826)
 
 # [4.78.0](https://github.com/GetStream/stream-chat-swiftui/releases/tag/4.78.0)
 _April 24, 2025_

Sources/StreamChatSwiftUI/ChatChannel/Composer/MessageComposerViewModel.swift

@@ -453,6 +453,13 @@ open class MessageComposerViewModel: ObservableObject {
     }
 
     public var showCommandsOverlay: Bool {
+        // Mentions are really not commands, but at the moment this flag controls
+        // if the mentions are displayed or not, so if the command is related to mentions
+        // then we need to ignore if commands are available or not.
+        let isMentionsSuggestions = composerCommand?.id == "mentions"
+        if isMentionsSuggestions {
+            return true
+        }
         let commandAvailable = composerCommand != nil
         let configuredCommandsAvailable = channelController.channel?.config.commands.count ?? 0 > 0
         return commandAvailable && configuredCommandsAvailable

StreamChatSwiftUITests/Tests/ChatChannel/MessageComposerViewModel_Tests.swift

@@ -659,6 +659,106 @@ class MessageComposerViewModel_Tests: StreamChatTestCase {
         XCTAssertFalse(viewModel.canSendPoll)
     }
 
+    func test_showCommandsOverlay() {
+        // Given
+        let channelController = makeChannelController()
+        let messageController = ChatMessageControllerSUI_Mock.mock(
+            chatClient: chatClient,
+            cid: .unique,
+            messageId: .unique
+        )
+        let viewModel = MessageComposerViewModel(
+            channelController: channelController,
+            messageController: messageController
+        )
+
+        // When
+        let channelConfig = ChannelConfig(commands: [.init()])
+        channelController.channel_mock = .mock(
+            cid: .unique,
+            config: channelConfig
+        )
+        viewModel.composerCommand = .init(id: "test", typingSuggestion: .empty, displayInfo: nil)
+
+        // Then
+        XCTAssertTrue(viewModel.showCommandsOverlay)
+    }
+
+    func test_showCommandsOverlay_whenComposerCommandIsNil_returnsFalse() {
+        // Given
+        let channelController = makeChannelController()
+        let messageController = ChatMessageControllerSUI_Mock.mock(
+            chatClient: chatClient,
+            cid: .unique,
+            messageId: .unique
+        )
+        let viewModel = MessageComposerViewModel(
+            channelController: channelController,
+            messageController: messageController
+        )
+
+        // When
+        let channelConfig = ChannelConfig(commands: [.init()])
+        channelController.channel_mock = .mock(
+            cid: .unique,
+            config: channelConfig
+        )
+        viewModel.composerCommand = nil
+
+        // Then
+        XCTAssertFalse(viewModel.showCommandsOverlay)
+    }
+
+    func test_showCommandsOverlay_whenCommandsAreDisabled_returnsFalse() {
+        // Given
+        let channelController = makeChannelController()
+        let messageController = ChatMessageControllerSUI_Mock.mock(
+            chatClient: chatClient,
+            cid: .unique,
+            messageId: .unique
+        )
+        let viewModel = MessageComposerViewModel(
+            channelController: channelController,
+            messageController: messageController
+        )
+
+        // When
+        let channelConfig = ChannelConfig(commands: [])
+        channelController.channel_mock = .mock(
+            cid: .unique,
+            config: channelConfig
+        )
+        viewModel.composerCommand = .init(id: "test", typingSuggestion: .empty, displayInfo: nil)
+
+        // Then
+        XCTAssertFalse(viewModel.showCommandsOverlay)
+    }
+
+    func test_showCommandsOverlay_whenCommandsAreDisabledButIsMentions_returnsTrue() {
+        // Given
+        let channelController = makeChannelController()
+        let messageController = ChatMessageControllerSUI_Mock.mock(
+            chatClient: chatClient,
+            cid: .unique,
+            messageId: .unique
+        )
+        let viewModel = MessageComposerViewModel(
+            channelController: channelController,
+            messageController: messageController
+        )
+
+        // When
+        let channelConfig = ChannelConfig(commands: [])
+        channelController.channel_mock = .mock(
+            cid: .unique,
+            config: channelConfig
+        )
+        viewModel.composerCommand = .init(id: "mentions", typingSuggestion: .empty, displayInfo: nil)
+
+        // Then
+        XCTAssertTrue(viewModel.showCommandsOverlay)
+    }
+
     func test_addedAsset_extraData() {
         // Given
         let image = UIImage(systemName: "person")!