merge call chain with flatMap (slight performance improvement)

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

@@ -1898,7 +1898,7 @@ class Account(
     fun getRelevantReports(note: Note): Set<Note> {
         val innerReports =
             if (note.event is RepostEvent || note.event is GenericRepostEvent) {
-                note.replyTo?.map { getRelevantReports(it) }?.flatten() ?: emptyList()
+                note.replyTo?.flatMap { getRelevantReports(it) } ?: emptyList()
             } else {
                 emptyList()
             }

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

@@ -2770,10 +2770,9 @@ object LocalCache : ILocalCache, ICacheProvider {
         val childrenToBeRemoved = mutableListOf<Note>()
 
         val toBeRemoved =
-            account.hiddenUsers.flow.value.hiddenUsers
+            account.hiddenUsers.flow.value.hiddenUsers.flatMap { userHex ->
-                .map { userHex ->
                 (notes.filter { _, it -> it.event?.pubKey == userHex } + addressables.filter { _, it -> it.event?.pubKey == userHex }).toSet()
-                }.flatten()
+            }
 
         toBeRemoved.forEach {
             removeFromCache(it)

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/AudioWaveformReadOnly.kt

@@ -170,7 +170,7 @@ internal fun <T> Iterable<T>.fillToSize(
     transform: (List<T>) -> T,
 ): List<T> {
     val capacity = ceil(size.safeDiv(count())).roundToInt()
-    return map { data -> List(capacity) { data } }.flatten().chunkToSize(size, transform)
+    return flatMap { data -> List(capacity) { data } }.chunkToSize(size, transform)
 }
 
 internal fun <T> Iterable<T>.chunkToSize(

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/elements/DisplayUncitedHashtags.kt

@@ -66,15 +66,15 @@ fun DisplayUncitedHashtags(
                 val tagsInContent =
                     state
                         .paragraphs
-                        .map {
+                        .flatMap { paragraphState ->
-                            it.words.mapNotNull {
+                            paragraphState.words.mapNotNull {
                                 if (it is HashTagSegment) {
                                     it.hashtag
                                 } else {
                                     null
                                 }
                             }
-                        }.flatten()
+                        }
 
                 val unusedHashtags =
                     tagsInEvent.filterNot { eventTag ->

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/profile/datasource/FilterUserProfilePosts.kt

@@ -76,8 +76,7 @@ fun filterUserProfilePosts(
         user.outboxRelays()?.ifEmpty { null }
             ?: (user.allUsedRelays() + LocalCache.relayHints.hintsForKey(user.pubkeyHex))
 
-    return relays
+    return relays.flatMap { relay ->
-        .map { relay ->
         listOf(
             RelayBasedFilter(
                 relay = relay,
@@ -100,5 +99,5 @@ fun filterUserProfilePosts(
                     ),
             ),
         )
-        }.flatten()
+    }
 }