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/select-language/SelectLangBtn.tsx

@@ -7,6 +7,7 @@ import {
 import {msg} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 
+import {LANG_DROPDOWN_HITSLOP} from '#/lib/constants'
 import {usePalette} from '#/lib/hooks/usePalette'
 import {isNative} from '#/platform/detection'
 import {useModalControls} from '#/state/modals'
@@ -102,6 +103,7 @@ export function SelectLangBtn() {
       items={items}
       openUpwards
       style={styles.button}
+      hitSlop={LANG_DROPDOWN_HITSLOP}
       accessibilityLabel={_(msg`Language selection`)}
       accessibilityHint="">
       {postLanguagesPref.length > 0 ? (
@@ -121,7 +123,7 @@ export function SelectLangBtn() {
 
 const styles = StyleSheet.create({
   button: {
-    paddingHorizontal: 15,
+    marginHorizontal: 15,
   },
   label: {
     maxWidth: 100,