Thread composer UI (#6050)

* Basic adding of posts

* Switch active post on focus

* Conditionally show plus button

* Insert posts midthread

* Track active/inactive post

* Delete posts in a thread

* Focus after deletion

* Tweak empty post detection

* Mix height for active only

* Move toolbar with post on web

* Fix footer positioning

* Post All button

* Fix reply to positioning

* Improve memoization

* Improve memoization for clearVideo

* Remove unnecessary argument

* Add some manual memoization to fix re-renders

* Scroll to bottom on add new

* Fix opacity on Android

* Add backdrop

* Fix videos

* Check alt for video too

* Clear pending publish on error

* Fork alt message by type

* Separate placeholder for next posts

* Limit hitslop to avoid clashes

src/view/com/composer/photos/Gallery.tsx

@@ -159,7 +159,10 @@ const GalleryItem = ({
   }
 
   return (
-    <View style={imageStyle}>
+    <View
+      style={imageStyle}
+      // Fixes ALT and icons appearing with half opacity when the post is inactive
+      renderToHardwareTextureAndroid>
       <TouchableOpacity
         testID="altTextButton"
         accessibilityRole="button"