QGuiApplication::commitDataRequest not received with local Qt but received with system Qt

[vlanquepin]

Hi,
I need to prevent Fedora 36 user session from closing, so I tried to connect to QGuiApplication::commitDataRequest signal and call cancel on the QSessionManager object.

This do the trick :

Helper::Helper(QObject *parent)
    : QObject(parent)
{
    connect(qApp, &QGuiApplication::commitDataRequest,
            this, &Helper::commitData);
}


void Helper::commitData(QSessionManager& manager)
{
    manager.cancel();
}

But only if my code is compiled with the Qt installed on my system (Qt 5.15.10 - /usr/lib64/qt5/) and not with the Qt installed locally (Qt 5.15.2 - /home/<user>/Qt/...).
If I execute this code compiled with the Qt installed into my home, the commitDataRequest signal is never received.

Any idea?

[SGaist]

Hi and welcome to devnet,

Does it also happen if you use Qt 6 ?

[vlanquepin]

Thanks @SGaist!

I installed Qt6 this morning (system and local) and yes I have the same behavior.

I receive QGuiApplication::commitDataRequest with system Qt6 but not with local Qt6...

[vlanquepin]

Still blocked. Anyone knows how commitDataRequest works in the low-level code? I would like to understand why my system Qt and my local Qt have not the same behavior on the same code...

[Christian Ehrlicher]

@vlanquepin said in QGuiApplication::commitDataRequest not received with local Qt but received with system Qt:

Anyone knows how commitDataRequest works in the low-level code?

Qt is open-source.

I would guess it's coming from the platform integration plugin so it's either not built correctly in your local Qt or can not connect to your WM/DM.