Only poll feed when feed page is focused (#2064)

* Do no poll when screen is not focused

* Avoid polling unless focused

* Handle homepage in background

* Fix the intl:check to ignore comments in diffs

---------

Co-authored-by: Paul Frazee <[e-mail]>

package.json

···
     "perf:test:results": "NODE_ENV=test flashlight report .perf/results.json",
     "perf:measure": "NODE_ENV=test flashlight measure",
     "intl:build": "yarn intl:check && yarn intl:compile",
-    "intl:check": "yarn intl:extract && git diff-index --quiet HEAD || (echo '\n⚠️ i18n detected un-extracted translations\n' && exit 1)",
+    "intl:check": "yarn intl:extract && git diff-index -G'(^[^\\*# /])|(^#\\w)|(^\\s+[^\\*#/])' HEAD || (echo '\n⚠️ i18n detected un-extracted translations\n' && exit 1)",
     "intl:extract": "lingui extract",
     "intl:compile": "lingui compile"
   },

src/view/com/feeds/FeedPage.tsx

···
     <View testID={testID} style={s.h100pct}>
       <Feed
         testID={testID ? `${testID}-feed` : undefined}
+        enabled={isPageFocused}
         feed={feed}
         feedParams={feedParams}
-        enabled={isPageFocused}
         pollInterval={POLL_FREQ}
         scrollElRef={scrollElRef}
         onScroll={onMainScroll}

src/view/com/posts/Feed.tsx

···
   const isEmpty = !isFetching && !data?.pages[0]?.slices.length
 
   const checkForNew = React.useCallback(async () => {
-    if (!data?.pages[0] || isFetching || !onHasNew) {
+    if (!data?.pages[0] || isFetching || !onHasNew || !enabled) {
       return
     }
     try {
···
     } catch (e) {
       logger.error('Poll latest failed', {feed, error: String(e)})
     }
-  }, [feed, data, isFetching, onHasNew])
+  }, [feed, data, isFetching, onHasNew, enabled])
 
   React.useEffect(() => {
     // we store the interval handler in a ref to avoid needless

src/view/screens/Home.tsx

···
 import React from 'react'
 import {View, ActivityIndicator, StyleSheet} from 'react-native'
-import {useFocusEffect} from '@react-navigation/native'
+import {useFocusEffect, useIsFocused} from '@react-navigation/native'
 import {NativeStackScreenProps, HomeTabNavigatorParams} from 'lib/routes/types'
 import {FeedDescriptor, FeedParams} from '#/state/queries/post-feed'
 import {FollowingEmptyState} from 'view/com/posts/FollowingEmptyState'
···
   const setMinimalShellMode = useSetMinimalShellMode()
   const setDrawerSwipeDisabled = useSetDrawerSwipeDisabled()
   const [selectedPage, setSelectedPage] = React.useState(0)
+  const isPageFocused = useIsFocused()
 
   /**
    * Used to ensure that we re-compute `customFeeds` AND force a re-render of
···
       <FeedPage
         key="1"
         testID="followingFeedPage"
-        isPageFocused={selectedPage === 0}
+        isPageFocused={selectedPage === 0 && isPageFocused}
         feed={homeFeedParams.mergeFeedEnabled ? 'home' : 'following'}
         feedParams={homeFeedParams}
         renderEmptyState={renderFollowingEmptyState}
···
           <FeedPage
             key={f}
             testID="customFeedPage"
-            isPageFocused={selectedPage === 1 + index}
+            isPageFocused={selectedPage === 1 + index && isPageFocused}
             feed={f}
             renderEmptyState={renderCustomFeedEmptyState}
           />
···
       tabBarPosition="top">
       <FeedPage
         testID="customFeedPage"
-        isPageFocused
+        isPageFocused={isPageFocused}
         feed={`feedgen|at://did:plc:z72i7hdynmk6r22z27h6tvur/app.bsky.feed.generator/whats-hot`}
         renderEmptyState={renderCustomFeedEmptyState}
       />

src/view/screens/Profile.tsx

···
       <View>
         <Feed
           testID="postsFeed"
+          enabled={isFocused}
           feed={feed}
           pollInterval={30e3}
           scrollElRef={scrollElRef}
···
           scrollEventThrottle={1}
           renderEmptyState={renderPostsEmpty}
           headerOffset={headerHeight}
-          enabled={isFocused}
         />
         {(isScrolledDown || hasNew) && (
           <LoadLatestBtn

src/view/screens/ProfileFeed.tsx

···
         isHeaderReady={true}
         renderHeader={renderHeader}
         onCurrentPageSelected={onCurrentPageSelected}>
-        {({onScroll, headerHeight, isScrolledDown, scrollElRef}) =>
+        {({onScroll, headerHeight, isScrolledDown, scrollElRef, isFocused}) =>
           isPublic ? (
             <FeedSection
               ref={feedSectionRef}
···
               scrollElRef={
                 scrollElRef as React.MutableRefObject<FlatList<any> | null>
               }
+              isFocused={isFocused}
             />
           ) : (
             <CenteredView sideBorders style={[{paddingTop: headerHeight}]}>
···
   headerHeight: number
   isScrolledDown: boolean
   scrollElRef: React.MutableRefObject<FlatList<any> | null>
+  isFocused: boolean
 }
 const FeedSection = React.forwardRef<SectionRef, FeedSectionProps>(
   function FeedSectionImpl(
-    {feed, onScroll, headerHeight, isScrolledDown, scrollElRef},
+    {feed, onScroll, headerHeight, isScrolledDown, scrollElRef, isFocused},
     ref,
   ) {
     const [hasNew, setHasNew] = React.useState(false)
···
     return (
       <View>
         <Feed
+          enabled={isFocused}
           feed={feed}
           pollInterval={30e3}
           scrollElRef={scrollElRef}

src/view/screens/ProfileList.tsx

···
           isHeaderReady={true}
           renderHeader={renderHeader}
           onCurrentPageSelected={onCurrentPageSelected}>
-          {({onScroll, headerHeight, isScrolledDown, scrollElRef}) => (
+          {({
+            onScroll,
+            headerHeight,
+            isScrolledDown,
+            scrollElRef,
+            isFocused,
+          }) => (
             <FeedSection
               ref={feedSectionRef}
               feed={`list|${uri}`}
···
               onScroll={onScroll}
               headerHeight={headerHeight}
               isScrolledDown={isScrolledDown}
+              isFocused={isFocused}
             />
           )}
           {({onScroll, headerHeight, isScrolledDown, scrollElRef}) => (
···
   headerHeight: number
   isScrolledDown: boolean
   scrollElRef: React.MutableRefObject<FlatList<any> | null>
+  isFocused: boolean
 }
 const FeedSection = React.forwardRef<SectionRef, FeedSectionProps>(
   function FeedSectionImpl(
-    {feed, scrollElRef, onScroll, headerHeight, isScrolledDown},
+    {feed, scrollElRef, onScroll, headerHeight, isScrolledDown, isFocused},
     ref,
   ) {
     const queryClient = useQueryClient()
···
       <View>
         <Feed
           testID="listFeed"
+          enabled={isFocused}
           feed={feed}
           pollInterval={30e3}
           scrollElRef={scrollElRef}