channellist: fix dual blue selection — block signals + explicit select

- selectionCommand: remove Current flag to avoid redundant
  currentChanged emission during mouse press
- loadChannels: wrap clear+repopulate in blockSignals(true/false)
  to prevent selectionChanged and currentChanged from firing
  on intermediate model states
- selectChannel: use explicit selectionModel()->select() with
  ClearAndSelect + setCurrentIndex with NoUpdate
- simplified selection restore: only track selectedCid by ID,
  removed fallback-to-row logic

tools/chatgui/src/channellist.cpp

@@ -51,7 +51,7 @@ protected:
     }
     QItemSelectionModel::SelectionFlags selectionCommand(const QModelIndex& idx, const QEvent* e) const override {
         if (idx.isValid())
-            return QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Current;
+            return QItemSelectionModel::ClearAndSelect;
         return QItemSelectionModel::NoUpdate;
     }
     void selectionChanged(const QItemSelection& sel, const QItemSelection& desel) override {
@@ -158,53 +158,52 @@ ChannelList::ChannelList(DbManager* db, QWidget *parent)
 }
 
 void ChannelList::loadChannels() {
-    QModelIndex curIdx = m_listView->currentIndex();
     QString selectedCid;
-    int selectedRow = -1;
-    if (curIdx.isValid()) {
-        selectedCid = curIdx.data(ChannelChannelIdRole).toString();
-        selectedRow = curIdx.row();
-    }
+    if (m_listView->currentIndex().isValid())
+        selectedCid = m_listView->currentIndex().data(ChannelChannelIdRole).toString();
 
+    auto* sel = m_listView->selectionModel();
+    sel->blockSignals(true);
     m_model->clear();
-    if (!m_db || !m_db->isOpen()) return;
-
-    auto channels = m_db->getChannels();
-    static const QColor colors[] = {
-        QColor(74,144,226), QColor(126,211,33), QColor(245,166,35),
-        QColor(208,2,27),   QColor(144,19,254), QColor(0,184,148)
-    };
-    int ci = 0;
-
-    for (const auto& ch : channels) {
-        auto letter = ch.name.mid(0, 1).toUpper();
-        if (letter.isEmpty()) letter = "#";
-        auto *item = new QStandardItem();
-        item->setData(ch.name,        ChannelNameRole);
-        item->setData(ch.channelId,   ChannelChannelIdRole);
-        item->setData(QString(),      ChannelLastMessageRole);
-        item->setData(makeChannelIcon(colors[ci % 6], letter), ChannelIconRole);
-        m_model->appendRow(item);
-        DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "ChannelList::loadChannels row=%d cid='%s' name='%s'",
-                   m_model->rowCount()-1, qPrintable(ch.channelId), qPrintable(ch.name));
-        ci++;
+    if (m_db && m_db->isOpen()) {
+        auto channels = m_db->getChannels();
+        static const QColor colors[] = {
+            QColor(74,144,226), QColor(126,211,33), QColor(245,166,35),
+            QColor(208,2,27),   QColor(144,19,254), QColor(0,184,148)
+        };
+        int ci = 0;
+
+        for (const auto& ch : channels) {
+            auto letter = ch.name.mid(0, 1).toUpper();
+            if (letter.isEmpty()) letter = "#";
+            auto *item = new QStandardItem();
+            item->setData(ch.name,        ChannelNameRole);
+            item->setData(ch.channelId,   ChannelChannelIdRole);
+            item->setData(QString(),      ChannelLastMessageRole);
+            item->setData(makeChannelIcon(colors[ci % 6], letter), ChannelIconRole);
+            m_model->appendRow(item);
+            DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "ChannelList::loadChannels row=%d cid='%s' name='%s'",
+                       m_model->rowCount()-1, qPrintable(ch.channelId), qPrintable(ch.name));
+            ci++;
+        }
     }
+    sel->blockSignals(false);
 
-    if (!selectedCid.isEmpty())
+    if (!selectedCid.isEmpty()) {
         selectChannel(selectedCid);
-    if (!m_listView->currentIndex().isValid()) {
-        int fallbackRow = (selectedRow >= 0) ? selectedRow : 0;
-        if (fallbackRow >= m_model->rowCount())
-            fallbackRow = m_model->rowCount() - 1;
-        if (fallbackRow >= 0)
-            m_listView->setCurrentIndex(m_model->index(fallbackRow, 0));
+    } else if (m_model->rowCount() > 0) {
+        QModelIndex idx = m_model->index(0, 0);
+        sel->select(idx, QItemSelectionModel::ClearAndSelect);
+        sel->setCurrentIndex(idx, QItemSelectionModel::NoUpdate);
     }
 }
 
 void ChannelList::selectChannel(const QString& channelId) {
     for (int row = 0; row < m_model->rowCount(); row++) {
         if (m_model->item(row)->data(ChannelChannelIdRole).toString() == channelId) {
-            m_listView->setCurrentIndex(m_model->index(row, 0));
+            QModelIndex idx = m_model->index(row, 0);
+            m_listView->selectionModel()->select(idx, QItemSelectionModel::ClearAndSelect);
+            m_listView->selectionModel()->setCurrentIndex(idx, QItemSelectionModel::NoUpdate);
             return;
         }
     }