Add local channel deletion to desktop channel settings

tools/chatgui/src/mainwindow.cpp

@@ -1355,6 +1355,23 @@ void MainWindow::onChannelPeersOnline(const char* ch_id, int ch_id_len, uint16_t
 }
 
 void MainWindow::reloadChannels() {
+    if (m_db && m_db->isOpen() && !m_currentChannelId.isEmpty() && !m_currentChannelId.startsWith(QStringLiteral("dm:"))) {
+        bool exists = false;
+        for (const auto& channel : m_db->getChannels()) if (channel.channelId == m_currentChannelId) { exists = true; break; }
+        if (!exists) {
+            DEBUG_INFO(DEBUG_CATEGORY_CHAT, "channel removed from GUI: channel=%s", qPrintable(m_currentChannelId));
+            for (int i = m_autoPlayQueue.size() - 1; i >= 0; --i) if (m_autoPlayQueue[i].channelId == m_currentChannelId) {
+                m_autoPlayDownloading.remove(m_autoPlayQueue[i].msgId);
+                m_autoPlayQueue.removeAt(i);
+            }
+            if (m_pendingChannelSelect == m_currentChannelId) m_pendingChannelSelect.clear();
+            m_messageList->loadChannel(QString());
+            m_accountList->setChannel(QString());
+            m_currentChannelId.clear();
+            saveLastChannelId(QString());
+            if (m_messageNotification) m_messageNotification->dismiss("channel deleted");
+        }
+    }
     if (m_channelList) {
         m_channelList->loadChannels();
         if (!m_pendingChannelSelect.isEmpty()) {