Fixed bug with ephemeral messages

Author: martinmitrevski

Sources/StreamChatSwiftUI/ChatChannel/ChatChannelViewModel.swift

@@ -397,7 +397,8 @@ open class ChatChannelViewModel: ObservableObject, MessagesDataSource {
                 return .animated
             case let .update(message, index: index):
                 if index.row < messages.count,
-                   message.messageId != messages[index.row].messageId {
+                   message.messageId != messages[index.row].messageId
+                   || message.type == .ephemeral {
                     skipChanges = false
                 }
             default:

StreamChatSwiftUITests/Tests/ChatChannel/ChatChannelViewModel_Tests.swift

@@ -261,6 +261,41 @@ class ChatChannelViewModel_Tests: StreamChatTestCase {
         XCTAssert(initial[0].messageId == after[0].messageId)
     }
 
+    func test_chatChannelVM_ephemeral() {
+        // Given
+        let channelController = makeChannelController()
+        let viewModel = ChatChannelViewModel(channelController: channelController)
+        let messageId = String.unique
+        let message = ChatMessage.mock(
+            id: messageId,
+            cid: .unique,
+            text: "Some text",
+            author: .mock(id: .unique)
+        )
+        let newMessage = ChatMessage.mock(
+            id: messageId,
+            cid: .unique,
+            text: "Some text",
+            type: .ephemeral,
+            author: .mock(id: .unique)
+        )
+        
+        // When
+        channelController.simulate(
+            messages: [message],
+            changes: [.update(message, index: .init(row: 0, section: 0))]
+        )
+        let initial = viewModel.messages
+        channelController.simulate(
+            messages: [newMessage],
+            changes: [.update(newMessage, index: .init(row: 0, section: 0))]
+        )
+        let after = viewModel.messages
+        
+        // Then
+        XCTAssert(initial[0].type != after[0].type)
+    }
+    
     func test_chatChannelVM_animatedChanges() {
         // Given
         let channelController = makeChannelController()