Fix crash when leaving group.

app/src/main/java/org/thoughtcrime/securesms/components/settings/conversation/ConversationSettingsEvent.kt

@@ -25,6 +25,10 @@ sealed class ConversationSettingsEvent {
     val failureReason: GroupChangeFailureReason
   ) : ConversationSettingsEvent()
 
+  class ShowBlockGroupError(
+    val failureReason: GroupChangeFailureReason
+  ) : ConversationSettingsEvent()
+
   class ShowGroupInvitesSentDialog(
     val invitesSentTo: List<Recipient>
   ) : ConversationSettingsEvent()

app/src/main/java/org/thoughtcrime/securesms/components/settings/conversation/ConversationSettingsFragment.kt

@@ -294,6 +294,7 @@ class ConversationSettingsFragment : DSLSettingsFragment(
         is ConversationSettingsEvent.AddMembersToGroup -> handleAddMembersToGroup(event)
         ConversationSettingsEvent.ShowGroupHardLimitDialog -> showGroupHardLimitDialog()
         is ConversationSettingsEvent.ShowAddMembersToGroupError -> showAddMembersToGroupError(event)
+        is ConversationSettingsEvent.ShowBlockGroupError -> showBlockGroupError(event)
         is ConversationSettingsEvent.ShowGroupInvitesSentDialog -> showGroupInvitesSentDialog(event)
         is ConversationSettingsEvent.ShowMembersAdded -> showMembersAdded(event)
       }
@@ -972,6 +973,10 @@ class ConversationSettingsFragment : DSLSettingsFragment(
     Toast.makeText(requireContext(), GroupErrors.getUserDisplayMessage(showAddMembersToGroupError.failureReason), Toast.LENGTH_LONG).show()
   }
 
+  private fun showBlockGroupError(showBlockGroupError: ConversationSettingsEvent.ShowBlockGroupError) {
+    Toast.makeText(requireContext(), GroupErrors.getUserDisplayMessage(showBlockGroupError.failureReason), Toast.LENGTH_LONG).show()
+  }
+
   private fun showGroupInvitesSentDialog(showGroupInvitesSentDialog: ConversationSettingsEvent.ShowGroupInvitesSentDialog) {
     GroupInviteSentDialog.showInvitesSent(requireContext(), viewLifecycleOwner, showGroupInvitesSentDialog.invitesSentTo)
   }

app/src/main/java/org/thoughtcrime/securesms/components/settings/conversation/ConversationSettingsRepository.kt

@@ -24,6 +24,8 @@ import org.thoughtcrime.securesms.groups.GroupId
 import org.thoughtcrime.securesms.groups.GroupProtoUtil
 import org.thoughtcrime.securesms.groups.GroupsInCommonRepository
 import org.thoughtcrime.securesms.groups.LiveGroup
+import org.thoughtcrime.securesms.groups.ui.GroupChangeFailureReason
+import org.thoughtcrime.securesms.groups.ui.GroupChangeResult
 import org.thoughtcrime.securesms.groups.v2.GroupAddMembersResult
 import org.thoughtcrime.securesms.groups.v2.GroupManagementRepository
 import org.thoughtcrime.securesms.keyvalue.SignalStore
@@ -187,10 +189,15 @@ class ConversationSettingsRepository(
     }
   }
 
-  fun block(groupId: GroupId) {
+  @WorkerThread
-    SignalExecutors.BOUNDED.execute {
+  fun block(groupId: GroupId): GroupChangeResult {
+    return try {
       val recipient = Recipient.externalGroupExact(groupId)
       RecipientUtil.block(context, recipient)
+      GroupChangeResult.SUCCESS
+    } catch (e: Exception) {
+      Log.w(TAG, "Failed to block group.", e)
+      GroupChangeResult.failure(GroupChangeFailureReason.fromException(e))
     }
   }
 

app/src/main/java/org/thoughtcrime/securesms/components/settings/conversation/ConversationSettingsViewModel.kt

@@ -6,6 +6,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.distinctUntilChanged
 import androidx.lifecycle.map
+import androidx.lifecycle.viewModelScope
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
 import io.reactivex.rxjava3.core.Maybe
 import io.reactivex.rxjava3.core.Observable
@@ -13,8 +14,11 @@ import io.reactivex.rxjava3.disposables.CompositeDisposable
 import io.reactivex.rxjava3.kotlin.plusAssign
 import io.reactivex.rxjava3.subjects.PublishSubject
 import io.reactivex.rxjava3.subjects.Subject
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.signal.core.util.Result
 import org.signal.core.util.ThreadUtil
+import org.signal.core.util.concurrent.SignalDispatchers
 import org.signal.core.util.concurrent.SignalExecutors
 import org.signal.core.util.readToList
 import org.thoughtcrime.securesms.components.settings.conversation.preferences.ButtonStripPreference
@@ -476,7 +480,15 @@ sealed class ConversationSettingsViewModel(
     }
 
     override fun block() {
-      repository.block(groupId)
+      viewModelScope.launch {
+        val result = withContext(SignalDispatchers.IO) {
+          repository.block(groupId)
+        }
+
+        if (!result.isSuccess) {
+          internalEvents.onNext(ConversationSettingsEvent.ShowBlockGroupError(result.getFailureReason()))
+        }
+      }
     }
 
     override fun unblock() {