Add option to hide history before given date when adding members to a channel.

[VelikovPetar]

🎯 Goal

Introduce the option to hide the channel history before a given timestamp for newly added members.
Resolves: https://linear.app/stream/issue/AND-923/llc-support

🛠 Implementation details

• Adds the hideHistoryBefore parameter to the ChatClient.addMembers() and ChannelClient.addMembers() methods.

🎨 UI Changes

No UI changes, LLC only

🧪 Testing

1. Apply the provided patch (sets hideHistoryBefore to 1 day ago)
2. Open a channel where you are owner
3. Add a new member
4. The member should only see the messages from the last day

Set hideHistoryBefore (patch)

Index: stream-chat-android-compose-sample/src/main/java/io/getstream/chat/android/compose/sample/ui/channel/AddMembersViewModel.kt
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/stream-chat-android-compose-sample/src/main/java/io/getstream/chat/android/compose/sample/ui/channel/AddMembersViewModel.kt b/stream-chat-android-compose-sample/src/main/java/io/getstream/chat/android/compose/sample/ui/channel/AddMembersViewModel.kt
--- a/stream-chat-android-compose-sample/src/main/java/io/getstream/chat/android/compose/sample/ui/channel/AddMembersViewModel.kt	(revision 7f3d80a90f912e90556e71f2e28b6a5253eae777)
+++ b/stream-chat-android-compose-sample/src/main/java/io/getstream/chat/android/compose/sample/ui/channel/AddMembersViewModel.kt	(date 1764099246140)
@@ -44,6 +44,8 @@
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
+import java.util.Date
+import kotlin.time.Duration.Companion.days
 
 class AddMembersViewModel(
     private val cid: String,
@@ -122,6 +124,10 @@
                     val params = AddMembersParams(
                         members = _state.value.selectedUsers.map { user -> MemberData(user.id) },
                         systemMessage = null,
+                        hideHistoryBefore = Date().apply {
+                            // 1 day before
+                            time = time - 1.days.inWholeMilliseconds
+                        }
                     )
                     chatClient
                         .channel(cid)

Demo
Screen.Recording.2025-11-25.at.20.35.57.mov

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-chat-android-client	5.25 MB	5.25 MB	0.00 MB	🟢
stream-chat-android-offline	5.47 MB	5.47 MB	0.00 MB	🟢
stream-chat-android-ui-components	10.58 MB	10.58 MB	0.00 MB	🟢
stream-chat-android-compose	12.81 MB	12.81 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate failed

Failed conditions
77.8% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud