Memoize the scaffold directive

Author: dturner

app/src/main/java/com/example/nav3recipes/scenes/materiallistdetail/MaterialListDetailActivity.kt

@@ -27,6 +27,7 @@ import androidx.compose.material3.adaptive.currentWindowAdaptiveInfo
 import androidx.compose.material3.adaptive.layout.calculatePaneScaffoldDirective
 import androidx.compose.material3.adaptive.navigation3.ListDetailSceneStrategy
 import androidx.compose.material3.adaptive.navigation3.rememberListDetailSceneStrategy
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.unit.dp
 import androidx.navigation3.runtime.NavKey
@@ -65,12 +66,14 @@ class MaterialListDetailActivity : ComponentActivity() {
         setContent {
 
             val backStack = rememberNavBackStack(ConversationList)
-            val listDetailStrategy = rememberListDetailSceneStrategy<NavKey>(
-                // Override the defaults so that there isn't a horizontal space between the panes.
-                directive = calculatePaneScaffoldDirective(
-                    windowAdaptiveInfo = currentWindowAdaptiveInfo()
-                ).copy(horizontalPartitionSpacerSize = 0.dp)
-            )
+
+            // Override the defaults so that there isn't a horizontal space between the panes.
+            val windowAdaptiveInfo = currentWindowAdaptiveInfo()
+            val directive = remember(windowAdaptiveInfo) {
+                calculatePaneScaffoldDirective(windowAdaptiveInfo)
+                    .copy(horizontalPartitionSpacerSize = 0.dp)
+            }
+            val listDetailStrategy = rememberListDetailSceneStrategy<NavKey>(directive = directive)
 
             NavDisplay(
                 backStack = backStack,