Apply 150ms delay to story chrome fadeout.

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/StoryViewerViewModel.kt

@@ -51,6 +51,8 @@ class StoryViewerViewModel(
   var hasConsumedInitialState = false
     private set
 
+  val isChildScrolling: Observable<Boolean> = childScrollStatePublisher.distinctUntilChanged()
+
   init {
     refresh()
   }

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/page/StoryViewerPageFragment.kt

@@ -235,6 +235,7 @@ class StoryViewerPageFragment :
         if ((canCloseFromHorizontalSlide || canCloseFromVerticalSlide) && event.actionMasked == MotionEvent.ACTION_UP) {
           requireActivity().onBackPressed()
         } else {
+          sharedViewModel.setIsChildScrolling(false)
           requireView().animate()
             .setInterpolator(StoryGestureListener.INTERPOLATOR)
             .setDuration(100)
@@ -294,6 +295,10 @@ class StoryViewerPageFragment :
       viewModel.setIsUserScrollingParent(isScrolling)
     }
 
+    lifecycleDisposable += sharedViewModel.isChildScrolling.subscribe {
+      viewModel.setIsUserScrollingChild(it)
+    }
+
     lifecycleDisposable += storyVolumeViewModel.state.distinctUntilChanged().observeOn(AndroidSchedulers.mainThread()).subscribe { volumeState ->
       if (volumeState.isMuted) {
         videoControlsDelegate.mute()

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/page/StoryViewerPageViewModel.kt

@@ -15,6 +15,7 @@ import org.thoughtcrime.securesms.recipients.RecipientId
 import org.thoughtcrime.securesms.util.livedata.Store
 import org.thoughtcrime.securesms.util.rx.RxStore
 import java.util.Optional
+import java.util.concurrent.TimeUnit
 import kotlin.math.max
 import kotlin.math.min
 
@@ -32,6 +33,7 @@ class StoryViewerPageViewModel(
   private val store = RxStore(StoryViewerPageState(isReceiptsEnabled = repository.isReadReceiptsEnabled()))
   private val disposables = CompositeDisposable()
   private val storyViewerDialogSubject: Subject<Optional<StoryViewerDialog>> = PublishSubject.create()
+  private val storyLongPressSubject: Subject<Boolean> = PublishSubject.create()
 
   private val storyViewerPlaybackStore = Store(StoryViewerPlaybackState())
 
@@ -88,6 +90,10 @@ class StoryViewerPageViewModel(
           .map { it.attachment }
       )
     }
+
+    disposables += storyLongPressSubject.debounce(150, TimeUnit.MILLISECONDS).subscribe { isLongPress ->
+      storyViewerPlaybackStore.update { it.copy(isUserLongTouching = isLongPress) }
+    }
   }
 
   override fun onCleared() {
@@ -183,6 +189,10 @@ class StoryViewerPageViewModel(
     storyViewerPlaybackStore.update { it.copy(isUserScrollingParent = isUserScrollingParent) }
   }
 
+  fun setIsUserScrollingChild(isUserScrollingChild: Boolean) {
+    storyViewerPlaybackStore.update { it.copy(isUserScrollingChild = isUserScrollingChild) }
+  }
+
   fun setIsDisplayingSlate(isDisplayingSlate: Boolean) {
     storyViewerPlaybackStore.update { it.copy(isDisplayingSlate = isDisplayingSlate) }
   }
@@ -225,6 +235,7 @@ class StoryViewerPageViewModel(
 
   fun setIsUserTouching(isUserTouching: Boolean) {
     storyViewerPlaybackStore.update { it.copy(isUserTouching = isUserTouching) }
+    storyLongPressSubject.onNext(isUserTouching)
   }
 
   fun setAreSegmentsInitialized(areSegmentsInitialized: Boolean) {

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/page/StoryViewerPlaybackState.kt

@@ -17,11 +17,13 @@ data class StoryViewerPlaybackState(
   val isDisplayingReactionAnimation: Boolean = false,
   val isRunningSharedElementAnimation: Boolean = false,
   val isDisplayingFirstTimeNavigation: Boolean = false,
-  val isDisplayingInfoDialog: Boolean = false
+  val isDisplayingInfoDialog: Boolean = false,
+  val isUserLongTouching: Boolean = false,
+  val isUserScrollingChild: Boolean = false
 ) {
   val hideChromeImmediate: Boolean = isRunningSharedElementAnimation
 
-  val hideChrome: Boolean = isRunningSharedElementAnimation || isUserTouching
+  val hideChrome: Boolean = isRunningSharedElementAnimation || isUserLongTouching || isUserScrollingChild
 
   val isPaused: Boolean = !areSegmentsInitialized ||
     isUserTouching ||