use modelMapOf and modelListOf - much nicer!

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

@@ -304,9 +304,7 @@ class MainActivity : AppCompatActivity(), Logging,
 
                     // We only care about nodes that have user info
                     info.user?.id?.let {
-                        val newnodes = NodeDB.nodes.value.toMutableMap()
-                        newnodes[it] = info
-                        NodeDB.nodes.value = newnodes
+                        NodeDB.nodes[it] = info
                     }
                 }
 
@@ -352,11 +350,13 @@ class MainActivity : AppCompatActivity(), Logging,
 
                 debug("connected to mesh service, isConnected=${UIState.isConnected.value}")
 
-                // make some placeholder nodeinfos
-                NodeDB.nodes.value =
-                    m.nodes.toList().map {
+                // Update our nodeinfos based on data from the device
+                NodeDB.nodes.clear()
+                NodeDB.nodes.putAll(
+                    m.nodes.map {
                         it.user?.id!! to it
-                    }.toMap()
+                    }
+                )
             }
 
         override fun onServiceDisconnected(name: ComponentName) {

app/src/main/java/com/geeksville/mesh/model/MessagesState.kt

@@ -1,7 +1,7 @@
 package com.geeksville.mesh.model
 
 import android.os.RemoteException
-import androidx.compose.mutableStateOf
+import androidx.compose.frames.modelListOf
 import com.geeksville.android.Logging
 import com.geeksville.mesh.MeshProtos
 import com.geeksville.mesh.utf8
@@ -21,7 +21,7 @@ data class TextMessage(
 
 
 object MessagesState : Logging {
-    val testTexts = listOf(
+    private val testTexts = arrayOf(
         TextMessage(
             "+16508765310",
             "I found the cache"
@@ -34,15 +34,11 @@ object MessagesState : Logging {
 
     // If the following (unused otherwise) line is commented out, the IDE preview window works.
     // if left in the preview always renders as empty.
-    val messages = mutableStateOf(testTexts, { a, b ->
-        a.size == b.size // If the # of messages changes, consider it important for rerender
-    })
+    val messages = modelListOf(*testTexts)
 
     /// add a message our GUI list of past msgs
     fun addMessage(m: TextMessage) {
-        val l = messages.value.toMutableList()
-        l.add(m)
-        messages.value = l
+        messages.add(m)
     }
 
     /// Send a message and added it to our GUI log

app/src/main/java/com/geeksville/mesh/model/NodeDB.kt

@@ -44,8 +44,8 @@ object NodeDB {
     val myId = mutableStateOf("+16508765309")
 
     /// A map from nodeid to to nodeinfo
-    val nodes = mutableStateOf(testNodes.map { it.user!!.id to it }.toMap())
+    val nodes = mutableMapOf(* testNodes.map { it.user!!.id to it }.toTypedArray())
 
     /// Could be null if we haven't received our node DB yet
-    val ourNodeInfo get() = nodes.value[myId.value!!]
+    val ourNodeInfo get() = nodes[myId.value!!]
 }

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

@@ -40,7 +40,7 @@ fun HomeContent() {
             Text(if (UIState.isConnected.value) "Connected" else "Not Connected")
         }
 
-        NodeDB.nodes.value.values.forEach {
+        NodeDB.nodes.values.forEach {
             NodeInfoCard(it)
         }
 

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

@@ -40,11 +40,11 @@ val TimestampEmphasis = object : Emphasis {
 @Composable
 fun MessageCard(msg: TextMessage, modifier: Modifier = Modifier.None) {
     Row(modifier = modifier) {
-        UserIcon(NodeDB.nodes.value[msg.from])
+        UserIcon(NodeDB.nodes[msg.from])
 
         Column(modifier = LayoutPadding(left = 12.dp)) {
             Row {
-                val nodes = NodeDB.nodes.value
+                val nodes = NodeDB.nodes
 
                 // If we can't find the sender, just use the ID
                 val node = nodes?.get(msg.from)
@@ -78,7 +78,7 @@ fun MessagesContent() {
             modifier = LayoutFlexible(1f)
         ) {
             Column {
-                messages.value.forEach { msg ->
+                messages.forEach { msg ->
                     MessageCard(
                         msg, modifier = LayoutPadding(
                             left = sidePad,