FeedFeedback fixes (#3968)

* Lower seen threshold to 1.5s

* Send feedContext for replies

* Use a simpler and more reliable feedContext fallback

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/lib/api/feed-manip.ts

@@ -71,6 +71,10 @@ export class FeedViewPostsSlice {
       ?.__source as ReasonFeedSource
   }
 
+  get feedContext() {
+    return this.items.find(item => item.feedContext)?.feedContext
+  }
+
   containsUri(uri: string) {
     return !!this.items.find(item => item.post.uri === uri)
   }

src/state/queries/post-feed.ts

@@ -303,7 +303,7 @@ export function usePostFeedQuery(
                               i === 0 && slice.source
                                 ? slice.source
                                 : item.reason,
-                            feedContext: item.feedContext,
+                            feedContext: item.feedContext || slice.feedContext,
                             moderation: moderations[i],
                           }
                         }

src/view/com/util/List.tsx

@@ -90,7 +90,7 @@ function ListImpl<ItemT>(
       },
       {
         itemVisiblePercentThreshold: 40,
-        minimumViewTime: 2e3,
+        minimumViewTime: 1.5e3,
       },
     ]
   }, [onItemSeen])

src/view/com/util/List.web.tsx

@@ -27,7 +27,7 @@ export type ListProps<ItemT> = Omit<
 }
 export type ListRef = React.MutableRefObject<any | null> // TODO: Better types.
 
-const ON_ITEM_SEEN_WAIT_DURATION = 2e3 // post must be "seen" 2 seconds before capturing
+const ON_ITEM_SEEN_WAIT_DURATION = 1.5e3 // when we consider post to  be "seen"
 const ON_ITEM_SEEN_INTERSECTION_OPTS = {
   rootMargin: '-200px 0px -200px 0px',
 } // post must be 200px visible to be "seen"