Remove vertical scrollbars from views on native (#3429)

* remove vertical scrollbars

* add to a few missing lists

* gate this change

* use `hide_vertical_scroll_indicators`

* fix gate lint

* fix bool

2 files changed, 24 insertions, 5 deletions

diff --git a/src/view/com/util/List.tsx b/src/view/com/util/List.tsx
index d30a9d805..b3bde2a11 100644
--- a/src/view/com/util/List.tsx
+++ b/src/view/com/util/List.tsx
@@ -1,11 +1,14 @@
 import React, {memo} from 'react'
 import {FlatListProps, RefreshControl} from 'react-native'
-import {FlatList_INTERNAL} from './Views'
-import {addStyle} from 'lib/styles'
-import {useScrollHandlers} from '#/lib/ScrollContext'
 import {runOnJS, useSharedValue} from 'react-native-reanimated'
+
 import {useAnimatedScrollHandler} from '#/lib/hooks/useAnimatedScrollHandler_FIXED'
 import {usePalette} from '#/lib/hooks/usePalette'
+import {useScrollHandlers} from '#/lib/ScrollContext'
+import {useGate} from 'lib/statsig/statsig'
+import {addStyle} from 'lib/styles'
+import {isWeb} from 'platform/detection'
+import {FlatList_INTERNAL} from './Views'
 
 export type ListMethods = FlatList_INTERNAL
 export type ListProps<ItemT> = Omit<
@@ -37,7 +40,8 @@ function ListImpl<ItemT>(
   const isScrolledDown = useSharedValue(false)
   const contextScrollHandlers = useScrollHandlers()
   const pal = usePalette('default')
-
+  const showsVerticalScrollIndicator =
+    !useGate('hide_vertical_scroll_indicators') || isWeb
   function handleScrolledDownChange(didScrollDown: boolean) {
     onScrolledDownChange?.(didScrollDown)
   }
@@ -93,6 +97,7 @@ function ListImpl<ItemT>(
       scrollEventThrottle={1}
       style={style}
       ref={ref}
+      showsVerticalScrollIndicator={showsVerticalScrollIndicator}
     />
   )
 }
diff --git a/src/view/com/util/Views.jsx b/src/view/com/util/Views.jsx
index 7d6120583..6850f42a4 100644
--- a/src/view/com/util/Views.jsx
+++ b/src/view/com/util/Views.jsx
@@ -2,8 +2,22 @@ import React from 'react'
 import {View} from 'react-native'
 import Animated from 'react-native-reanimated'
 
+import {useGate} from 'lib/statsig/statsig'
+
 export const FlatList_INTERNAL = Animated.FlatList
-export const ScrollView = Animated.ScrollView
 export function CenteredView(props) {
   return <View {...props} />
 }
+
+export function ScrollView(props) {
+  const showsVerticalScrollIndicator = !useGate(
+    'hide_vertical_scroll_indicators',
+  )
+
+  return (
+    <Animated.ScrollView
+      {...props}
+      showsVerticalScrollIndicator={showsVerticalScrollIndicator}
+    />
+  )
+}