Fix keyboard flicker when selecting a draft in composer (#9864)

(cherry picked from commit c46219bc4d)

src/view/com/composer/drafts/DraftsListDialog.tsx

@@ -1,5 +1,5 @@
 import {useCallback, useEffect, useMemo} from 'react'
-import {View} from 'react-native'
+import {Keyboard, View} from 'react-native'
 import {msg, Trans} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 
@@ -53,6 +53,12 @@ export function DraftsListDialog({
 
   const handleSelectDraft = useCallback(
     (summary: DraftSummary) => {
+      // Dismiss keyboard immediately to prevent flicker. Without this,
+      // the text input regains focus (showing the keyboard) after the
+      // drafts sheet closes, then loses it again when the post component
+      // remounts with the draft content, causing a show-hide-show cycle -sfn
+      Keyboard.dismiss()
+
       control.close(() => {
         onSelectDraft(summary)
       })