Handle multiple line names

Add function to get the display name for an author on a single line as nothing stops there being linebreaks.

BUG:476731

src/eventhandler.cpp

@@ -169,6 +169,28 @@ QString EventHandler::getAuthorDisplayName(bool isPending) const
     }
 }
 
+QString EventHandler::singleLineAuthorDisplayname(bool isPending) const
+{
+    if (m_room == nullptr) {
+        qCWarning(EventHandling) << "getAuthorDisplayName called with m_room set to nullptr.";
+        return {};
+    }
+    if (m_event == nullptr) {
+        qCWarning(EventHandling) << "getAuthorDisplayName called with m_event set to nullptr.";
+        return {};
+    }
+
+    const auto author = isPending ? m_room->localUser() : m_room->user(m_event->senderId());
+    auto displayName = m_room->htmlSafeMemberName(author->id());
+    displayName.replace(QStringLiteral("<br>\n"), QStringLiteral(" "));
+    displayName.replace(QStringLiteral("<br>"), QStringLiteral(" "));
+    displayName.replace(QStringLiteral("<br />\n"), QStringLiteral(" "));
+    displayName.replace(QStringLiteral("<br />"), QStringLiteral(" "));
+    displayName.replace(u'\n', QStringLiteral(" "));
+    displayName.replace(u'\u2028', QStringLiteral(" "));
+    return displayName;
+}
+
 QDateTime EventHandler::getTime(bool isPending, QDateTime lastUpdated) const
 {
     if (m_event == nullptr) {

src/eventhandler.h

@@ -111,6 +111,17 @@ public:
      */
     QString getAuthorDisplayName(bool isPending = false) const;
 
+    /**
+     * @brief Get the display name of the event author but with any newlines removed.
+     *
+     * Turns out you can put newlines in your display name so we need to handle that
+     * primarily for the room list subtitle.
+     *
+     * @param isPending whether the event is pending as this cannot be derived from
+     *                  just the event object.
+     */
+    QString singleLineAuthorDisplayname(bool isPending = false) const;
+
     /**
      * @brief Return a QDateTime object for the event timestamp.
      */

src/neochatroom.cpp

@@ -355,7 +355,7 @@ QString NeoChatRoom::lastEventToString(Qt::TextFormat format, bool stripNewlines
             body = eventHandler.getPlainBody(stripNewlines);
         }
 
-        return safeMemberName(event->senderId()) + (event->isStateEvent() ? QLatin1String(" ") : QLatin1String(": ")) + body;
+        return eventHandler.singleLineAuthorDisplayname() + (event->isStateEvent() ? QLatin1String(" ") : QLatin1String(": ")) + body;
     }
     return {};
 }