Fix problem of old messages not being remembered

app/src/main/java/com/geeksville/mesh/MainActivity.kt

@@ -423,7 +423,7 @@ class MainActivity : AppCompatActivity(), Logging,
 
     private fun updateConnectionStatusImage(connected: MeshService.ConnectionState) {
 
-        if (actionBarMenu==null)
+        if (actionBarMenu == null)
             return
 
         val (image, tooltip) = when (connected) {
@@ -736,7 +736,9 @@ class MainActivity : AppCompatActivity(), Logging,
             registerMeshReceiver()
 
             // Init our messages table with the service's record of past text messages
-            model.messagesState.messages.value = service.oldMessages
+            val msgs = service.oldMessages
+            debug("Service provided ${msgs.size} messages")
+            model.messagesState.messages.value = msgs
             val connectionState =
                 MeshService.ConnectionState.valueOf(service.connectionState())
 

app/src/main/java/com/geeksville/mesh/service/MeshService.kt

@@ -605,13 +605,13 @@ class MeshService : Service(), Logging {
     }
 
     /**
-     * discard entire node db & message state - used when changing radio channels
+     * discard entire node db & message state - used when downloading a new db from the device
      */
     private fun discardNodeDB() {
         myNodeInfo = null
         nodeDBbyNodeNum.clear()
         nodeDBbyID.clear()
-        recentDataPackets.clear()
+        // recentDataPackets.clear() We do NOT want to clear this, because it is the record of old messages the GUI still might want to show
         haveNodeDB = false
     }
 
@@ -1024,6 +1024,9 @@ class MeshService : Service(), Logging {
 
         /// Perform all the steps needed once we start waiting for device sleep to complete
         fun startDeviceSleep() {
+            // Just in case the user uncleanly reboots the phone, save now (we normally save in onDestroy)
+            saveSettings()
+
             // lost radio connection, therefore no need to keep listening to GPS
             stopLocationRequests()
 

app/src/main/java/com/geeksville/mesh/ui/MessagesFragment.kt

@@ -187,7 +187,8 @@ class MessagesFragment : ScreenFragment("Messages"), Logging {
         layoutManager.stackFromEnd = true // We want the last rows to always be shown
         messageListView.layoutManager = layoutManager
 
-        model.messagesState.messages.observe(viewLifecycleOwner, Observer { it ->
+        model.messagesState.messages.observe(viewLifecycleOwner, Observer {
+            debug("New messages received: ${it.size}")
             messagesAdapter.onMessagesChanged(it)
         })