Render device settings before BT profile state arrives

app/src/main/java/eu/darken/capod/main/ui/devicesettings/DeviceSettingsViewModel.kt

@@ -33,6 +33,7 @@ import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.isActive
+import kotlinx.coroutines.flow.onStart
 import java.time.Instant
 import javax.inject.Inject
 
@@ -80,7 +81,9 @@ class DeviceSettingsViewModel @Inject constructor(
             deviceForProfile(profileId),
             upgradeRepo.upgradeInfo,
             isForceConnecting,
-            bluetoothManager.connectedDevices,
+            // The Bluetooth HEADSET profile lookup can be slow to produce its first value.
+            // Seed this branch so the screen can render immediately after navigation.
+            bluetoothManager.connectedDevices.onStart { emit(emptyList()) },
         ) { _, device, upgrade, forcing, connectedDevices ->
             val connectedAddresses = connectedDevices.map { it.address }.toSet()
             State(

app/src/test/java/eu/darken/capod/main/ui/devicesettings/DeviceSettingsViewModelTest.kt

@@ -21,13 +21,16 @@ import io.mockk.verify
 import kotlinx.coroutines.CompletableDeferred
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.awaitCancellation
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.test.UnconfinedTestDispatcher
 import kotlinx.coroutines.test.resetMain
 import kotlinx.coroutines.test.runTest
 import kotlinx.coroutines.test.setMain
+import kotlinx.coroutines.withTimeout
 import org.junit.jupiter.api.AfterEach
 import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
@@ -298,4 +301,17 @@ class DeviceSettingsViewModelTest : BaseTest() {
 
         vm.state.first().isClassicallyConnected shouldBe false
     }
+
+    @Test
+    fun `state emits even when connected devices flow has not emitted yet`() = runTest(testDispatcher) {
+        every { bluetoothManager.connectedDevices } returns flow { awaitCancellation() }
+
+        val vm = createViewModel()
+        vm.initialize(testAddress)
+
+        val state = withTimeout(1_000) { vm.state.first() }
+
+        state.device?.address shouldBe testAddress
+        state.isClassicallyConnected shouldBe false
+    }
 }