qt, refactor: Replace BitcoinGUI::trayIconActivated with a lambda

src/qt/bitcoingui.cpp

@@ -789,7 +789,12 @@ void BitcoinGUI::createTrayIconMenu()
         return;
 
     trayIcon->setContextMenu(trayIconMenu.get());
-    connect(trayIcon, &QSystemTrayIcon::activated, this, &BitcoinGUI::trayIconActivated);
+    connect(trayIcon, &QSystemTrayIcon::activated, [this](QSystemTrayIcon::ActivationReason reason) {
+        if (reason == QSystemTrayIcon::Trigger) {
+            // Click on system tray icon triggers show/hide of the main window
+            toggleHidden();
+        }
+    });
 #else
     // Note: On macOS, the Dock icon is used to provide the tray's functionality.
     MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
@@ -822,17 +827,6 @@ void BitcoinGUI::createTrayIconMenu()
 #endif
 }
 
-#ifndef Q_OS_MAC
-void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
-{
-    if(reason == QSystemTrayIcon::Trigger)
-    {
-        // Click on system tray icon triggers show/hide of the main window
-        toggleHidden();
-    }
-}
-#endif
-
 void BitcoinGUI::optionsClicked()
 {
     openOptionsDialogWithTab(OptionsDialog::TAB_MAIN);

src/qt/bitcoingui.h

@@ -302,10 +302,6 @@ public Q_SLOTS:
     void showDebugWindowActivateConsole();
     /** Show help message dialog */
     void showHelpMessageClicked();
-#ifndef Q_OS_MAC
-    /** Handle tray icon clicked */
-    void trayIconActivated(QSystemTrayIcon::ActivationReason reason);
-#endif
 
     /** Show window if hidden, unminimize when minimized, rise when obscured or show if hidden and fToggleHidden is true */
     void showNormalIfMinimized() { showNormalIfMinimized(false); }