Identical Code in Multiple Signal Handlers Causes Silent Failure

Wallace Stevens

I've encountered a peculiar issue with QML signal handlers that I can't explain. When I have identical code in multiple signal handlers (like onClicked and onTriggered), the application silently fails to work. Here's a minimal example to demonstrate:

// ApplicationWindow.qml
import QtQuick
import QtQuick.Controls
import QtQuick.Layouts
import Qt.labs.platform as Platform

ApplicationWindow {
    ToolButton {
        text: "Home"
        onClicked: {
            WindowManager.open("ui.page", "Home", {
                parent: root,
                mode: WindowManager.Reuse
            });
        }
    }

    Platform.SystemTrayIcon {
        menu: Platform.Menu {
            Platform.MenuItem {
                text: "Home"
                onTriggered: {
                    WindowManager.open("ui.page", "Home", {
                        parent: root,
                        mode: WindowManager.Reuse
                    });
                }
            }
        }
    }
}

If I use this code in either onClicked or onTriggered alone, it works perfectly
If I have the same code in both handlers, the application silently fails (no errors, no warnings)
Even commenting out one of the handlers (instead of deleting) doesn't fix it - I must completely remove one
The code works again after removing one handler entirely

Environment:

Qt 6.8.0
Windows 11

Wallace Stevens

If the code within the signal handler is the same, the program can be compiled but it will fail to run and even cannot be debugged.