Fix sidefps visibility.

In ag/21915461, there seems to be a regression where the side fps does
not hide when the bouncer hides. This is likely caused by a race
condition between the visibility and when startingToHide is called.

We can fix this by updating the side fps visibility when hide is called
instead of startingToHide.

Fixes: 273563764
Bug: 263924084
Test: added a unit test.
Test: Show bouncer with side fps and hide the bouncer.
Change-Id: Idacf9e74ed3c0f7c2a03d5dd6ffa128b49c50c05

packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardBouncerViewModel.kt

@@ -70,7 +70,7 @@ constructor(
     /** Observe whether we should update fps is showing. */
     val shouldUpdateSideFps: Flow<Unit> =
         merge(
-            interactor.startingToHide,
+            interactor.hide,
             interactor.show,
             interactor.startingDisappearAnimation.filterNotNull().map {}
         )

packages/SystemUI/tests/src/com/android/systemui/keyguard/ui/viewmodel/KeyguardBouncerViewModelTest.kt

@@ -93,7 +93,7 @@ class KeyguardBouncerViewModelTest : SysuiTestCase() {
     }
 
     @Test
-    fun shouldUpdateSideFps() = runTest {
+    fun shouldUpdateSideFps_show() = runTest {
         var count = 0
         val job = underTest.shouldUpdateSideFps.onEach { count++ }.launchIn(this)
         repository.setPrimaryShow(true)
@@ -103,6 +103,18 @@ class KeyguardBouncerViewModelTest : SysuiTestCase() {
         job.cancel()
     }
 
+    @Test
+    fun shouldUpdateSideFps_hide() = runTest {
+        repository.setPrimaryShow(true)
+        var count = 0
+        val job = underTest.shouldUpdateSideFps.onEach { count++ }.launchIn(this)
+        repository.setPrimaryShow(false)
+        // Run the tasks that are pending at this point of virtual time.
+        runCurrent()
+        assertThat(count).isEqualTo(1)
+        job.cancel()
+    }
+
     @Test
     fun sideFpsShowing() = runTest {
         var sideFpsIsShowing = false