Add group invitation button to desktop PM header

tools/chatgui/src/messagelist.cpp

@@ -365,6 +365,24 @@ MessageList::MessageList(DbManager* db, AudioRecorder* recorder, QWidget *parent
         m_talkingLabel->hide();
         hl->addWidget(m_talkingLabel);
 
+        m_inviteBtn = new QPushButton(QStringLiteral("+"), header);
+        m_inviteBtn->setAccessibleName(QStringLiteral("Пригласить в группу"));
+        m_inviteBtn->setToolTip(QStringLiteral("Пригласить в группу"));
+        m_inviteBtn->setFixedSize(34, 30);
+        m_inviteBtn->setCursor(Qt::PointingHandCursor);
+        m_inviteBtn->hide();
+        hl->addWidget(m_inviteBtn);
+        connect(m_inviteBtn, &QPushButton::clicked, this, [this]() {
+            if (!m_db || !isDmChannel(m_currentChannelId)) return;
+            for (const auto& conv : m_db->getDmConversations()) {
+                if (conv.convId == dmConvId(m_currentChannelId)) {
+                    emit inviteRequested(QString(), conv.peerNodeId, m_channelTitle->text());
+                    return;
+                }
+            }
+            GUI_ERROR("invite PM: conversation not found target=%s", qPrintable(m_currentChannelId));
+        });
+
         m_callBtn = new QPushButton(QStringLiteral("☎"), header);
         m_callBtn->setAccessibleName(QStringLiteral("Позвонить"));
         m_callBtn->setFixedSize(34, 30);
@@ -625,6 +643,7 @@ void MessageList::loadChannel(const QString& channelId) {
     m_currentChannelId = channelId;
     clearDmCallRoute();
     m_callBtn->setVisible(isDmChannel(channelId));
+    m_inviteBtn->setVisible(isDmChannel(channelId));
     m_peerStatus->setVisible(isDmChannel(channelId));
     m_radioBtn->setVisible(!isDmChannel(channelId));
     m_inputBar->setRecordingContext(m_db ? m_db->dbPath() + "/media" : QString(), channelId);