Load enough backlog to fill the screen after reconnect, fixes #64

Signed-off-by: Janne Koschinski <janne@kuschku.de>

app/src/main/java/de/kuschku/quasseldroid/ui/chat/messages/MessageListFragment.kt

@@ -321,7 +321,7 @@ class MessageListFragment : ServiceBoundFragment() {
       this, Observer {
       if (it?.orNull() == ConnectionState.CONNECTED) {
         runInBackgroundDelayed(16) {
-          loadMore()
+          loadMore(initial = true)
         }
       }
     })
@@ -457,8 +457,10 @@ class MessageListFragment : ServiceBoundFragment() {
     }
     // Try loading messages when switching to isEmpty buffer
     if (database.message().bufferSize(current) == 0) {
+      if (current > 0 && current != Int.MAX_VALUE) {
         loadMore(initial = true)
       }
+    }
     activity?.runOnUiThread { messageList.scrollToPosition(0) }
   }
 
@@ -474,8 +476,11 @@ class MessageListFragment : ServiceBoundFragment() {
   }
 
   private fun loadMore(initial: Boolean = false, lastMessageId: MsgId? = null) {
-    runInBackground {
+    requireActivity().runOnUiThread {
       viewModel.buffer { bufferId ->
+        if (bufferId > 0 && bufferId != Int.MAX_VALUE) {
+          if (initial) swipeRefreshLayout.isRefreshing = true
+          runInBackground {
             viewModel.session {
               it.orNull()?.backlogManager?.requestBacklog(
                 bufferId = bufferId,
@@ -488,6 +493,8 @@ class MessageListFragment : ServiceBoundFragment() {
           }
         }
       }
+    }
+  }
 
   companion object {
     private const val KEY_STATE_LIST = "KEY_STATE_LIST"