Add support for editing for published statuses (#16697)

* Add support for editing for published statuses

* Fix references to stripped-out code

* Various fixes and improvements

* Further fixes and improvements

* Fix updates being potentially sent to unauthorized recipients

* Various fixes and improvements

* Fix wrong words in test

* Fix notifying accounts that were tagged but were not in the audience

* Fix mistake

app/javascript/mastodon/components/status.js

@@ -57,6 +57,7 @@ const messages = defineMessages({
   unlisted_short: { id: 'privacy.unlisted.short', defaultMessage: 'Unlisted' },
   private_short: { id: 'privacy.private.short', defaultMessage: 'Followers-only' },
   direct_short: { id: 'privacy.direct.short', defaultMessage: 'Direct' },
+  edited: { id: 'status.edited', defaultMessage: 'Edited {date}' },
 });
 
 export default @injectIntl
@@ -483,7 +484,7 @@ class Status extends ImmutablePureComponent {
             <div className='status__info'>
               <a onClick={this.handleClick} href={status.get('url')} className='status__relative-time' target='_blank' rel='noopener noreferrer'>
                 <span className='status__visibility-icon'><Icon id={visibilityIcon.icon} title={visibilityIcon.text} /></span>
-                <RelativeTimestamp timestamp={status.get('created_at')} />
+                <RelativeTimestamp timestamp={status.get('created_at')} />{status.get('edited_at') && <abbr title={intl.formatMessage(messages.edited, { date: intl.formatDate(status.get('edited_at'), { hour12: false, year: 'numeric', month: 'short', day: '2-digit', hour: '2-digit', minute: '2-digit' }) })}> *</abbr>}
               </a>
 
               <a onClick={this.handleAccountClick} href={status.getIn(['account', 'url'])} title={status.getIn(['account', 'acct'])} className='status__display-name' target='_blank' rel='noopener noreferrer'>