Activate desktop invite links on clicks while preserving drag selection

tools/chatgui/src/chatview.cpp

@@ -180,6 +180,19 @@ void ChatView::mouseMoveEvent(QMouseEvent *event) {
 }
 
 void ChatView::mouseReleaseEvent(QMouseEvent *event) {
+    const QModelIndex pressed(m_pressIndex);
+    if (event->button() == Qt::LeftButton && !m_selecting && pressed.isValid() &&
+        (event->pos() - m_pressPos).manhattanLength() < 5 && indexAt(event->pos()) == pressed) {
+        auto* delegate = qobject_cast<MessageDelegate*>(itemDelegate(pressed));
+        QStyleOptionViewItem option; option.initFrom(this); option.widget = this; option.rect = visualRect(pressed);
+        const QString link = delegate ? delegate->inviteLinkAt(option, pressed, event->pos()) : QString();
+        if (!link.isEmpty()) {
+            m_pressIndex = QPersistentModelIndex();
+            GUI_INFO("invite link: activated row=%d bytes=%d", pressed.row(), link.size());
+            emit inviteLinkActivated(link);
+            event->accept(); return;
+        }
+    }
     if (event->button() == Qt::LeftButton && m_selecting) {
         m_selecting = false;
         viewport()->update();