fix: @ in message resets the format - EXO-69693.

Before this change, when type a message having multiple line and add @ anywhere in message and send message. After this change, this message is sent and displayed correctly.

application/src/main/webapp/vue-app/components/ExoChatMessageComposer.vue

@@ -383,21 +383,21 @@ export default {
       elem.style.height = `${elem.scrollHeight + BORDER_SIZE}px`;
       elem.scrollTop = elem.scrollHeight;
     },
-    checkMention(message) {
-      message = $('<div />').html(message).text();
+    checkMention(msg) {
+      let message = $('<div />').html(msg).text();
       message = message.replace(/\s\s+/g, ' ');
       message = this.encodeHTMLEntities(message);
       for (const element of this.participants) {
         if (message.includes(`@${element.fullname}`) ){
           this.mentionedUsers.push(element.name);
           const profil = chatServices.getUserProfileLink(element.name);
           const html = `<a href='${profil}' target='_blank'>@${element.fullname}</a>`;
-          message = message.replaceAll(`@${element.fullname}`, html);
+          msg = message.replaceAll(`@${element.fullname}`, html);
         }
       }
       chatServices.sendMentionNotification(this.contact.room, this.contact.fullName, this.mentionedUsers);
       this.mentionedUsers = [];
-      return message;
+      return msg;
     },
     encodeHTMLEntities(text) {
       const textArea = document.createElement('p');