Fix signal connection nodiscard warnings (#4818)

src/widgets/splits/SplitHeader.hpp

@@ -32,6 +32,8 @@ public:
 
     void updateChannelText();
     void updateModerationModeIcon();
+    // Invoked when SplitHeader should update anything refering to a TwitchChannel's mode
+    // has changed (e.g. sub mode toggled)
     void updateRoomModes();
 
 protected:
@@ -75,7 +77,14 @@ private:
     // ui
     Button *dropdownButton_{};
     Label *titleLabel_{};
+
     EffectLabel *modeButton_{};
+    QAction *modeActionSetEmote{};
+    QAction *modeActionSetSub{};
+    QAction *modeActionSetSlow{};
+    QAction *modeActionSetR9k{};
+    QAction *modeActionSetFollowers{};
+
     Button *moderationButton_{};
     Button *viewersButton_{};
     Button *addButton_{};
@@ -86,8 +95,8 @@ private:
     bool doubleClicked_{false};
     bool menuVisible_{false};
 
-    // signals
-    pajlada::Signals::NoArgSignal modeUpdateRequested_;
+    // managedConnections_ contains connections for signals that are not managed by us
+    // and don't change when the parent Split changes its underlying channel
     pajlada::Signals::SignalHolder managedConnections_;
     pajlada::Signals::SignalHolder channelConnections_;
     std::vector<boost::signals2::scoped_connection> bSignals_;