feat: fetch latest 50 messages on channel load

just something temporary so i have stuff to test with

app/src/main/java/chat/revolt/api/routes/channel/Channel.kt

@@ -5,10 +5,12 @@ import chat.revolt.api.RevoltHttp
 import chat.revolt.api.RevoltJson
 import chat.revolt.api.internals.ULID
 import chat.revolt.api.schemas.Embed
+import chat.revolt.api.schemas.Message
 import chat.revolt.api.schemas.MessagesInChannel
 import io.ktor.client.request.*
 import io.ktor.client.statement.*
 import io.ktor.http.*
+import kotlinx.serialization.builtins.ListSerializer
 
 suspend fun fetchMessagesFromChannel(
     channelId: String,
@@ -32,10 +34,23 @@ suspend fun fetchMessagesFromChannel(
     }
         .bodyAsText()
 
-    return RevoltJson.decodeFromString(
-        MessagesInChannel.serializer(),
-        response
-    )
+    if (include_users) {
+        return RevoltJson.decodeFromString(
+            MessagesInChannel.serializer(),
+            response
+        )
+    } else {
+        val messages = RevoltJson.decodeFromString(
+            ListSerializer(Message.serializer()),
+            response
+        )
+
+        return MessagesInChannel(
+            messages = messages,
+            users = emptyList(),
+            members = emptyList()
+        )
+    }
 }
 
 @kotlinx.serialization.Serializable

app/src/main/java/chat/revolt/screens/chat/views/ChannelScreen.kt

@@ -27,6 +27,7 @@ import chat.revolt.api.schemas.Message as MessageSchema
 import chat.revolt.components.chat.Message
 import kotlinx.coroutines.launch
 import chat.revolt.R
+import chat.revolt.api.routes.channel.fetchMessagesFromChannel
 import chat.revolt.components.chat.MessageField
 
 class ChannelScreenViewModel : ViewModel() {
@@ -99,6 +100,24 @@ class ChannelScreenViewModel : ViewModel() {
         RealtimeSocket.registerChannelCallback(channel!!.id!!, callbacks!!)
     }
 
+    fun fetchMessages() {
+        if (channel == null) {
+            return
+        }
+
+        viewModelScope.launch {
+            fetchMessagesFromChannel(channel!!.id!!, limit = 50, false).let {
+                it.messages!!.reversed().forEach { message ->
+                    addUserIfUnknown(message.author!!)
+                    if (!RevoltAPI.messageCache.containsKey(message.id)) {
+                        RevoltAPI.messageCache[message.id!!] = message
+                    }
+                    _renderableMessages.add(message)
+                }
+            }
+        }
+    }
+
     fun fetchChannel(id: String) {
         if (id in RevoltAPI.channelCache) {
             _channel = RevoltAPI.channelCache[id]
@@ -107,6 +126,7 @@ class ChannelScreenViewModel : ViewModel() {
         }
 
         registerCallback()
+        fetchMessages()
     }
 
     fun sendPendingMessage() {