Notifications: Display the link in the subject line.

Added a new data called linkText. If the link in the activity JSON
has a space in it, the part before that is considered the link text.
If it does not contain a space, the word [link] is used.

This is maybe a solution for #6236

src/gui/activitydata.h

@@ -57,6 +57,7 @@ class Activity
     QString _message;
     QString _file;
     QUrl _link;
+    QString _linkText;
     QDateTime _dateTime;
     QString _accName;
 

src/gui/notificationwidget.cpp

@@ -44,6 +44,16 @@ void NotificationWidget::setActivity(const Activity &activity)
     _ui._subjectLabel->setVisible(!activity._subject.isEmpty());
     _ui._messageLabel->setVisible(!activity._message.isEmpty());
 
+    QString subject = activity._subject;
+    if( !activity._link.isEmpty() ) {
+        // append a link to the message, if that is empty, to subject
+        subject.append(QString("&nbsp;<a href=\"%1\">%2</a>")
+                       .arg(activity._link.toString(QUrl::FullyEncoded))
+                       .arg(activity._linkText));
+        _ui._subjectLabel->setTextFormat(Qt::RichText);
+        _ui._subjectLabel->setOpenExternalLinks(true);
+
+    }
     _ui._subjectLabel->setText(activity._subject);
     _ui._messageLabel->setText(activity._message);
 

src/gui/servernotificationhandler.cpp

@@ -81,7 +81,16 @@ void ServerNotificationHandler::slotNotificationsReceived(const QJsonDocument &j
         a._message = json.value("message").toString();
         QString s = json.value("link").toString();
         if (!s.isEmpty()) {
-            a._link = QUrl(s);
+            // if there is a real whitespace in the link, the part before the space
+            // is rendered as a link text
+            if( s.contains(QChar(' '))) {
+                const QStringList li = s.split(QChar(' '));
+                a._link = QUrl(li.at(1));
+                a._linkText = li.at(0);
+            } else {
+                a._link = QUrl(s);
+                a._linkText = QString("[%1]").arg(tr("link"));
+            }
         }
         a._dateTime = QDateTime::fromString(json.value("datetime").toString(), Qt::ISODate);