Improve group name coloring performance.

app/src/main/java/org/thoughtcrime/securesms/database/model/GroupRecord.kt

@@ -13,7 +13,8 @@ import org.thoughtcrime.securesms.recipients.Recipient
 import org.thoughtcrime.securesms.recipients.RecipientId
 import org.whispersystems.signalservice.api.groupsv2.DecryptedGroupUtil
 import org.whispersystems.signalservice.api.push.DistributionId
-import java.lang.AssertionError
+import org.whispersystems.signalservice.api.push.ServiceId
+import org.whispersystems.signalservice.api.util.UuidUtil
 import java.util.Optional
 
 class GroupRecord(
@@ -44,6 +45,22 @@ class GroupRecord(
     }
   }
 
+  /** Valid for v2 groups only */
+  val decryptedMemberServiceIds: List<ServiceId> by lazy {
+    if (isV2Group) {
+      requireV2GroupProperties()
+        .decryptedGroup
+        .membersList
+        .asSequence()
+        .map { DecryptedGroupUtil.toUuid(it) }
+        .filterNot { it == UuidUtil.UNKNOWN_UUID }
+        .map { ServiceId.from(it) }
+        .toList()
+    } else {
+      emptyList()
+    }
+  }
+
   /** V1 members that were lost during the V1->V2 migration  */
   val unmigratedV1Members: List<RecipientId> by lazy {
     if (serializedUnmigratedV1Members.isNullOrEmpty()) {
@@ -183,4 +200,12 @@ class GroupRecord(
     }
     return false
   }
+
+  fun hasSameMembers(other: GroupRecord): Boolean {
+    if (!isV2Group || !other.isV2Group) {
+      return false
+    }
+
+    return decryptedMemberServiceIds == other.decryptedMemberServiceIds
+  }
 }