Reduces the amount of wasted memory by using Array<Array<List>> as opposed to List<List<String>> for tags.

app/src/main/java/com/vitorpamplona/amethyst/model/Note.kt

@@ -284,7 +284,7 @@ open class Note(val idHex: String) {
     }
 
     fun removeReaction(note: Note) {
-        val tags = note.event?.tags() ?: emptyList()
+        val tags = note.event?.tags() ?: emptyArray()
         val reaction = note.event?.content()?.firstFullCharOrEmoji(ImmutableListOfLists(tags)) ?: "+"
 
         if (reaction in reactions.keys && reactions[reaction]?.contains(note) == true) {
@@ -403,7 +403,7 @@ open class Note(val idHex: String) {
     }
 
     fun addReaction(note: Note) {
-        val tags = note.event?.tags() ?: emptyList()
+        val tags = note.event?.tags() ?: emptyArray()
         val reaction = note.event?.content()?.firstFullCharOrEmoji(ImmutableListOfLists(tags)) ?: "+"
 
         if (reaction !in reactions.keys) {

app/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -1586,7 +1586,7 @@ fun RenderAppDefinition(
                     Row(verticalAlignment = Alignment.Bottom, modifier = Modifier.padding(top = 7.dp)) {
                         CreateTextWithEmoji(
                             text = it,
-                            tags = remember { (note.event?.tags() ?: emptyList()).toImmutableListOfLists() },
+                            tags = remember { (note.event?.tags() ?: emptyArray()).toImmutableListOfLists() },
                             fontWeight = FontWeight.Bold,
                             fontSize = 25.sp
                         )

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/CardFeedState.kt

@@ -64,7 +64,7 @@ class MultiSetCard(
     )
 
     val likeEventsByType = likeEvents.groupBy {
-        it.event?.content()?.firstFullCharOrEmoji(ImmutableListOfLists(it.event?.tags() ?: emptyList())) ?: "+"
+        it.event?.content()?.firstFullCharOrEmoji(ImmutableListOfLists(it.event?.tags() ?: emptyArray())) ?: "+"
     }.mapValues {
         it.value.toImmutableList()
     }.toImmutableMap()