Pinned Message: Adjust width (#5550)

src/components/middle/panes/HeaderPinnedMessage.tsx

@@ -55,6 +55,7 @@ import PinnedMessageNavigation from '../PinnedMessageNavigation';
 
 import styles from './HeaderPinnedMessage.module.scss';
 
+const MAX_LENGTH = 256;
 const SHOW_LOADER_DELAY = 450;
 const EMOJI_SIZE = 1.125 * REM;
 
@@ -312,6 +313,7 @@ const HeaderPinnedMessage = ({
             <p dir="auto" className={styles.summary}>
               <MessageSummary
                 message={renderingPinnedMessage}
+                truncateLength={MAX_LENGTH}
                 noEmoji={Boolean(mediaThumbnail)}
                 emojiSize={EMOJI_SIZE}
               />