How to disable specific QML debugger warning

Question

I don't want to disable all warnings from QML (as asked in this question). Instead I want to disable a specific type of warning. In my case the TypeError: Cannot read property of null warning.

Note that I am getting this warning as a result of a Qt bug that affects grandchildren elements during their destruction, not as a result of any code errors, I believe. In my case, I get lots of these warnings (10s to 100s) each time a particular GridView model is changed, so these messages are dominating the console log.

Answer 1

I think a high level solution would probably be based on installing custom message handler and intercept all warnings, filter out any warning you like to deal with in a different way and bypass others, this for example can handle your case:

// Default message handler to be called to bypass all other warnings.
static const QtMessageHandler QT_DEFAULT_MESSAGE_HANDLER = qInstallMessageHandler(0);
// a custom message handler to intercept warnings
void customMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString & msg)
{
    switch (type) {
    case QtWarningMsg: {
        if (!msg.contains("TypeError: Cannot read property of null")){ // suppress this warning
            (*QT_DEFAULT_MESSAGE_HANDLER)(type, context, msg); // bypass and display all other warnings
        }
    }
    break;
    default:    // Call the default handler.
        (*QT_DEFAULT_MESSAGE_HANDLER)(type, context, msg);
        break;
    }
}

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    qInstallMessageHandler(customMessageHandler); // install custom msg handler
...
}