Experiment: Stabilize FollowableTopic + lambda

Change-Id: Ib13bcf58f34da618db4145c8357b97577003e59e

core/model/build.gradle.kts

@@ -15,9 +15,16 @@
  */
 
 plugins {
-    id("nowinandroid.jvm.library")
+    id("nowinandroid.android.library")
+}
+
+android {
+    namespace = "com.google.samples.apps.nowinandroid.model"
 }
 
 dependencies {
     implementation(libs.kotlinx.datetime)
+    val composeBom = platform(libs.androidx.compose.bom)
+    implementation(composeBom)
+    implementation(libs.androidx.compose.runtime)
 }

core/model/src/main/java/com/google/samples/apps/nowinandroid/core/model/data/FollowableTopic.kt

@@ -16,9 +16,12 @@
 
 package com.google.samples.apps.nowinandroid.core.model.data
 
+import androidx.compose.runtime.Stable
+
 /**
  * A [topic] with the additional information for whether or not it is followed.
  */
+@Stable
 data class FollowableTopic( // TODO consider changing to UserTopic and flattening
     val topic: Topic,
     val isFollowed: Boolean,

feature/foryou/src/main/java/com/google/samples/apps/nowinandroid/feature/foryou/ForYouScreen.kt

@@ -62,6 +62,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.toArgb
@@ -109,12 +110,15 @@ internal fun ForYouRoute(
     val isSyncing by viewModel.isSyncing.collectAsStateWithLifecycle()
     val deepLinkedUserNewsResource by viewModel.deepLinkedNewsResource.collectAsStateWithLifecycle()
 
+    val onTopicCheckedChangedRem: (String, Boolean) -> Unit =
+        remember { viewModel::updateTopicSelection }
+
     ForYouScreen(
         isSyncing = isSyncing,
         onboardingUiState = onboardingUiState,
         feedState = feedState,
         deepLinkedUserNewsResource = deepLinkedUserNewsResource,
-        onTopicCheckedChanged = viewModel::updateTopicSelection,
+        onTopicCheckedChanged = onTopicCheckedChangedRem,
         onDeepLinkOpened = viewModel::onDeepLinkOpened,
         onTopicClick = onTopicClick,
         saveFollowedTopics = viewModel::dismissOnboarding,
@@ -259,9 +263,9 @@ private fun LazyGridScope.onboarding(
                         style = MaterialTheme.typography.bodyMedium,
                     )
                     TopicSelection(
-                        onboardingUiState,
-                        onTopicCheckedChanged,
-                        Modifier.padding(bottom = 8.dp),
+                        onboardingUiState = onboardingUiState,
+                        onTopicCheckedChanged = onTopicCheckedChanged,
+                        modifier = Modifier.padding(bottom = 8.dp),
                     )
                     // Done button
                     Row(

feature/foryou/src/main/java/com/google/samples/apps/nowinandroid/feature/foryou/OnboardingUiState.kt

@@ -16,11 +16,13 @@
 
 package com.google.samples.apps.nowinandroid.feature.foryou
 
+import androidx.compose.runtime.Stable
 import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 
 /**
  * A sealed hierarchy describing the onboarding state for the for you screen.
  */
+@Stable
 sealed interface OnboardingUiState {
     /**
      * The onboarding state is loading.
@@ -40,6 +42,7 @@ sealed interface OnboardingUiState {
     /**
      * There is a onboarding state, with the given lists of topics.
      */
+    @Stable
     data class Shown(
         val topics: List<FollowableTopic>,
     ) : OnboardingUiState {