update channel list selection when channel mention is clicked

components/channels.cpp

@@ -414,6 +414,12 @@ void ChannelList::Clear() {
     m_update_dispatcher.emit();
 }
 
+void ChannelList::SetActiveChannel(Snowflake id) {
+    auto it = m_id_to_row.find(id);
+    if (it == m_id_to_row.end()) return;
+    m_list->select_row(*it->second);
+}
+
 void ChannelList::CollapseRow(ChannelListRow *row) {
     row->Collapse();
     for (auto child : row->Children) {

components/channels.hpp

@@ -94,6 +94,8 @@ public:
     void UpdateGuild(Snowflake id);
     void Clear();
 
+    void SetActiveChannel(Snowflake id);
+
 protected:
     Gtk::ListBox *m_list;
     Gtk::ScrolledWindow *m_main;