Improves list of visible authors on live stream bubbles

amethyst/src/main/java/com/vitorpamplona/amethyst/model/Channel.kt

@@ -48,6 +48,8 @@ abstract class Channel : NotesGatherer {
         return new
     }
 
+    open fun participatingAuthors() = notes.mapNotNull { key, value -> value.author }
+
     abstract fun toBestDisplayName(): String
 
     open fun relays(): Set<NormalizedRelayUrl> =

amethyst/src/main/java/com/vitorpamplona/amethyst/service/relayClient/reqCommand/channel/ChannelObservers.kt

@@ -26,6 +26,7 @@ import androidx.compose.runtime.remember
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.vitorpamplona.amethyst.model.Channel
 import com.vitorpamplona.amethyst.model.ChannelState
+import com.vitorpamplona.amethyst.model.LocalCache.notes
 import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.model.nip28PublicChats.PublicChatChannel
 import com.vitorpamplona.amethyst.model.nip53LiveActivities.LiveActivitiesChannel
@@ -69,16 +70,10 @@ fun observeChannelNoteAuthors(
                 .flow()
                 .notes.stateFlow
                 .mapLatest {
-                    it.channel.notes
+                    channelToParticipatingUsers(it.channel, accountViewModel)
-                        .mapNotNull { key, value -> value.author }
-                        .toSet()
-                        .toImmutableList()
                 }.onStart {
                     emit(
-                        baseChannel.notes
+                        channelToParticipatingUsers(baseChannel, accountViewModel),
-                            .mapNotNull { key, value -> value.author }
-                            .toSet()
-                            .toImmutableList(),
                     )
                 }.distinctUntilChanged()
                 .flowOn(Dispatchers.Default)
@@ -87,6 +82,41 @@ fun observeChannelNoteAuthors(
     return flow.collectAsStateWithLifecycle(persistentListOf())
 }
 
+private fun channelToParticipatingUsers(
+    channel: Channel,
+    accountViewModel: AccountViewModel,
+): ImmutableList<User> {
+    val users = mutableSetOf<User>()
+
+    channel.participatingAuthors().forEach {
+        users.add(it)
+    }
+
+    if (channel is LiveActivitiesChannel) {
+        val noteAuthor = channel.infoNote?.author
+        if (noteAuthor != null) {
+            users.add(noteAuthor)
+        }
+
+        val pKeys = channel.info?.participantKeys() ?: emptyList()
+
+        pKeys.forEach {
+            val u = accountViewModel.checkGetOrCreateUser(it)
+            if (u != null) {
+                users.add(u)
+            }
+        }
+    }
+
+    return users
+        .sortedWith(
+            compareBy(
+                { !accountViewModel.isFollowing(it) },
+                { it.pubkeyHex },
+            ),
+        ).toImmutableList()
+}
+
 @OptIn(ExperimentalCoroutinesApi::class)
 @Composable
 fun observeChannelPicture(

quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/LiveActivitiesEvent.kt

@@ -89,6 +89,8 @@ class LiveActivitiesEvent(
 
     fun totalParticipants() = tags.firstNotNullOfOrNull(TotalParticipantsTag::parse)
 
+    fun participantKeys(): List<HexKey> = tags.mapNotNull(ParticipantTag::parseKey)
+
     fun participants() = tags.mapNotNull(ParticipantTag::parse)
 
     fun relays() = tags.mapNotNull(RelayListTag::parse)