How to use progressTextChanged() signal in QFutureWatcher

[DiamonDogX]

I have a task I want to run upon clicking a button. I want the method to be run in a separate thread so as not to hang up the GUI while it is running (the GUI does indeed hang with my current code below). I also want the method running the task to report back text information to be appended to a TextEdit control, e.g. "Starting task...", "Reading file...", "Performing computation...", etc. I've set up a QFuture, QFutureWatcher, etc. but not sure how to actually emit the progressTextChanged signal and not sure why GUI is hanging:

//...
//...
QFuture<bool> future = QtConcurrent::run( 
        this, 
        &MyClass::runTheTask );
 
    QFutureWatcher<bool> watcher;
    connect( &watcher, SIGNAL( progressTextChanged( const QString ) ), 
             this, SLOT( appendMessageToStatusLineEdit( const QString ) ) );
    watcher.setFuture( future );
    future.waitForFinished();
 
// ...
// ...

//...
//...
QFuture<bool> future = QtConcurrent::run( 
        this, 
        &MyClass::runTheTask );

    QFutureWatcher<bool> watcher;
    connect( &watcher, SIGNAL( progressTextChanged( const QString ) ), 
             this, SLOT( appendMessageToStatusLineEdit( const QString ) ) );
    watcher.setFuture( future );
    future.waitForFinished();

// ...
// ...

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bool MyClass::runTheTask()
{
// emit progress text signal???
 
// currently I have something like the following:
appendMessageToStatusLineEdit( "Status update..." ); // don't see this happen until the entire task is complete for some reason
// more code
// etc.
}
 
void MyClass::appendMessageToStatusLineEdit( const QString msg )
{
    QMetaObject::invokeMethod( this, 
                               "doAppendMessageToStatusLineEdit", 
                               Qt::QueuedConnection,
                               Q_ARG( QString, msg ) );
}
 
void MyClass::doAppendMessageToStatusLineEdit( const QString msg )
{
    _ui->statusTextEdit->append( msg );
}

bool MyClass::runTheTask()
{
// emit progress text signal???

// currently I have something like the following:
appendMessageToStatusLineEdit( "Status update..." ); // don't see this happen until the entire task is complete for some reason
// more code
// etc.
}

void MyClass::appendMessageToStatusLineEdit( const QString msg )
{
    QMetaObject::invokeMethod( this, 
                               "doAppendMessageToStatusLineEdit", 
                               Qt::QueuedConnection,
                               Q_ARG( QString, msg ) );
}

void MyClass::doAppendMessageToStatusLineEdit( const QString msg )
{
    _ui->statusTextEdit->append( msg );
}

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