Add confirm modal for unboosting toots (#10287)

[#3815]

Display the boost modal also when unboosting toots.

app/javascript/mastodon/containers/status_container.js

@@ -69,19 +69,19 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
   },
 
   onModalReblog (status) {
-    dispatch(reblog(status));
-  },
-
-  onReblog (status, e) {
     if (status.get('reblogged')) {
       dispatch(unreblog(status));
     } else {
+      dispatch(reblog(status));
+    }
+  },
+
+  onReblog (status, e) {
     if (e.shiftKey || !boostModal) {
       this.onModalReblog(status);
     } else {
       dispatch(openModal('BOOST', { status, onReblog: this.onModalReblog }));
     }
-    }
   },
 
   onFavourite (status) {

app/javascript/mastodon/features/ui/components/boost_modal.js

@@ -11,6 +11,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
+  cancel_reblog: { id: 'status.cancel_reblog_private', defaultMessage: 'Unboost' },
   reblog: { id: 'status.reblog', defaultMessage: 'Boost' },
 });
 
@@ -51,6 +52,7 @@ class BoostModal extends ImmutablePureComponent {
 
   render () {
     const { status, intl } = this.props;
+    const buttonText = status.get('reblogged') ? messages.cancel_reblog : messages.reblog;
 
     return (
       <div className='modal-root__modal boost-modal'>
@@ -76,7 +78,7 @@ class BoostModal extends ImmutablePureComponent {
 
         <div className='boost-modal__action-bar'>
           <div><FormattedMessage id='boost_modal.combo' defaultMessage='You can press {combo} to skip this next time' values={{ combo: <span>Shift + <Icon id='retweet' /></span> }} /></div>
-          <Button text={intl.formatMessage(messages.reblog)} onClick={this.handleReblog} ref={this.setRef} />
+          <Button text={intl.formatMessage(buttonText)} onClick={this.handleReblog} ref={this.setRef} />
         </div>
       </div>
     );