Only give the loading spinner on the home feed during PTR (#207)

(cherry picked from commit b7a5da12fdfacef74873b5cf6d75f20d259bde0e)

src/view/com/posts/Feed.tsx

@@ -1,4 +1,4 @@
-import React, {MutableRefObject, useEffect} from 'react'
+import React, {MutableRefObject} from 'react'
 import {observer} from 'mobx-react-lite'
 import {
   ActivityIndicator,
@@ -38,8 +38,9 @@ export const Feed = observer(function Feed({
   headerOffset?: number
 }) {
   const {screen, track} = useAnalytics()
+  const [isRefreshing, setIsRefreshing] = React.useState(false)
 
-  useEffect(() => {
+  React.useEffect(() => {
     screen('Feed')
   }, [screen])
 
@@ -63,19 +64,23 @@ export const Feed = observer(function Feed({
     }
     return <FeedItem item={item} />
   }
-  const onRefresh = () => {
+  const onRefresh = async () => {
     track('Feed:onRefresh')
-    feed
+    setIsRefreshing(true)
-      .refresh()
+    try {
-      .catch(err =>
+      await feed.refresh()
-        feed.rootStore.log.error('Failed to refresh posts feed', err),
+    } catch (err) {
-      )
+      feed.rootStore.log.error('Failed to refresh posts feed', err)
     }
-  const onEndReached = () => {
+    setIsRefreshing(false)
+  }
+  const onEndReached = async () => {
     track('Feed:onEndReached')
-    feed
+    try {
-      .loadMore()
+      await feed.loadMore()
-      .catch(err => feed.rootStore.log.error('Failed to load more posts', err))
+    } catch (err) {
+      feed.rootStore.log.error('Failed to load more posts', err)
+    }
   }
   let data: any[] = []
   if (feed.hasError) {
@@ -110,7 +115,7 @@ export const Feed = observer(function Feed({
           keyExtractor={item => item._reactKey}
           renderItem={renderItem}
           ListFooterComponent={FeedFooter}
-          refreshing={feed.isRefreshing}
+          refreshing={isRefreshing}
           contentContainerStyle={s.contentContainer}
           onScroll={onScroll}
           onRefresh={onRefresh}