Rename post preview component again

I want to reuse it for the reply placeholder as well, and that will
require injecting a composer state instance, so this naming seems to
make more sense.

js/src/forum/compat.js

@@ -61,7 +61,7 @@ import NotificationList from './components/NotificationList';
 import WelcomeHero from './components/WelcomeHero';
 import SignUpModal from './components/SignUpModal';
 import CommentPost from './components/CommentPost';
-import TextFormatterPreview from './components/TextFormatterPreview';
+import ComposerPostPreview from './components/ComposerPostPreview';
 import ReplyComposer from './components/ReplyComposer';
 import NotificationsPage from './components/NotificationsPage';
 import PostStreamScrubber from './components/PostStreamScrubber';
@@ -136,7 +136,7 @@ export default Object.assign(compat, {
   'components/WelcomeHero': WelcomeHero,
   'components/SignUpModal': SignUpModal,
   'components/CommentPost': CommentPost,
-  'components/TextFormatterPreview': TextFormatterPreview,
+  'components/ComposerPostPreview': ComposerPostPreview,
   'components/ReplyComposer': ReplyComposer,
   'components/NotificationsPage': NotificationsPage,
   'components/PostStreamScrubber': PostStreamScrubber,

js/src/forum/components/CommentPost.js

@@ -7,7 +7,7 @@ import EditPostComposer from './EditPostComposer';
 import ItemList from '../../common/utils/ItemList';
 import listItems from '../../common/helpers/listItems';
 import Button from '../../common/components/Button';
-import TextFormatterPreview from './TextFormatterPreview';
+import ComposerPostPreview from './ComposerPostPreview';
 
 /**
  * The `CommentPost` component displays a standard `comment`-typed post. This
@@ -51,7 +51,7 @@ export default class CommentPost extends Post {
         <ul>{listItems(this.headerItems().toArray())}</ul>
       </header>,
       <div className="Post-body">
-        {this.isEditing() ? <TextFormatterPreview content={() => app.composer.fields.content()} /> : m.trust(this.attrs.post.contentHtml())}
+        {this.isEditing() ? <ComposerPostPreview content={() => app.composer.fields.content()} /> : m.trust(this.attrs.post.contentHtml())}
       </div>,
     ]);
   }

js/src/forum/components/ComposerPostPreview.js

@@ -3,7 +3,7 @@
 import Component from '../../common/Component';
 
 /**
- * The `TextFormatterPreview` component renders Markdown as HTML using the
+ * The `ComposerPostPreview` component renders Markdown as HTML using the
  * TextFormatter library, polling a data source for changes every 50ms. This is
  * done to prevent expensive redraws on e.g. every single keystroke, while
  * still retaining the perception of live updates for the user.
@@ -12,7 +12,7 @@ import Component from '../../common/Component';
  *
  * - `content` A callback that retrieves the latest content that should be rendered.
  */
-export default class TextFormatterPreview extends Component {
+export default class ComposerPostPreview extends Component {
   view() {
     return <div className="Post-preview" />;
   }