fix(chat): prevent timeline prefetch ANRs (#985)

app/src/test/java/com/m57/hermescontrol/ui/chat/components/ChatTimelinePrefetchStrategyTest.kt

@@ -0,0 +1,33 @@
+package com.m57.hermescontrol.ui.chat.components
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.lazy.LazyListLayoutInfo
+import androidx.compose.foundation.lazy.LazyListPrefetchScope
+import androidx.compose.foundation.lazy.layout.NestedPrefetchScope
+import io.mockk.mockk
+import io.mockk.verify
+import org.junit.Test
+
+@OptIn(ExperimentalFoundationApi::class)
+class ChatTimelinePrefetchStrategyTest {
+    @Test
+    fun strategy_neverSchedulesOffscreenChatItems() {
+        val scope = mockk<LazyListPrefetchScope>(relaxed = true)
+        val layoutInfo = mockk<LazyListLayoutInfo>(relaxed = true)
+        val nestedScope = mockk<NestedPrefetchScope>(relaxed = true)
+
+        with(ChatTimelineNoPrefetchStrategy) {
+            with(scope) {
+                onScroll(delta = 120f, layoutInfo)
+                onVisibleItemsUpdated(layoutInfo)
+            }
+            with(nestedScope) {
+                onNestedPrefetch(firstVisibleItemIndex = 10)
+            }
+        }
+
+        verify(exactly = 0) { scope.schedulePrefetch(any(), any()) }
+        verify(exactly = 0) { nestedScope.schedulePrecomposition(any()) }
+        verify(exactly = 0) { nestedScope.schedulePrecompositionAndPremeasure(any(), any()) }
+    }
+}