autofocus the compose form again on /share (#23094)

app/javascript/mastodon/features/standalone/compose/index.js

@@ -9,7 +9,7 @@ export default class Compose extends React.PureComponent {
   render () {
     return (
       <div>
-        <ComposeFormContainer />
+        <ComposeFormContainer autoFocus />
         <NotificationsContainer />
         <ModalContainer />
         <LoadingBarContainer className='loading-bar' />

app/javascript/mastodon/reducers/compose.js

@@ -222,8 +222,8 @@ const privacyPreference = (a, b) => {
 const hydrate = (state, hydratedState) => {
   state = clearAll(state.merge(hydratedState));
 
-  if (hydratedState.has('text')) {
-    state = state.set('text', hydratedState.get('text'));
+  if (hydratedState.get('text')) {
+    state = state.set('text', hydratedState.get('text')).set('focusDate', new Date());
   }
 
   return state;