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

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

src/view/com/feeds/FeedPage.tsx

@@ -158,9 +158,9 @@ export function FeedPage({
     <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}