QMainWindow::restoreState doesn't bring floating QDockWidgets to the front

A floating dock widget is not automatically brought in front of existing windows from other applications when restoring main window state

I am using QMainWindow::restoreState() at application startup to successfully restore undocked QDockWidgets to their floating position.

The issue I have is that while QMainWindow is brought to the front, the floating QDockWidget is not.

This is illustrated by having a terminal window open, and starting my application from the command line.

If the floating QDockWidget is restored to a position that is in the same region as the terminal window, then it comes up below the terminal window. I have to move the terminal to reveal the QDockWidget.

Work around:

I have a work around in that I call QWidget::activateWindow() on the QDockWidget to bring it in front of my terminal, and then on the QMainWindow so that this is the active window, which would probably be the expected behaviour.

Code:

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void App::show()
{    
    QMainWindow* _main = new QMainWindow();
 
    QDockWidget* _table = new QDockWidget(_main);
    _table->setObjectName("table");
    _main->addDockWidget(Qt::RightDockWidgetArea, _table);
 
    _main->restoreState();
 
    _table->activateWindow(); // bring QDockWidget to the front
    _main->activateWindow();  // make QMainWindow the active window
 
    _main->show();
}

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If I don't use QWidget::activateWindow() on the QDockWidget, then it's hidden behind the existing terminal window.

Is it possible to get this behaviour without having to iterate over all widgets calling QWidget::activateWindow()? As the number of widgets grows it will get somewhat onerous.

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Added after 13 minutes:

I have made a somewhat feasible workaround by inheriting QMainWindow and overriding QMainWindow::show()

Code:

---

void MyMainWindow::show()
{
    QList<QDockWidget*> dock_widgets = findChildren<QDockWidget*>();
 
    for (QDockWidget* dock_widget : dock_widgets)
    {
        dock_widget->activateWindow();
    }
 
    activateWindow();
    QMainWindow::show();
}

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It still seems a bit broken though

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Added after 1 25 minutes:

Fixed!

The problem is restoring state before showing the window

Code:

---

void App::show()
{    
    QMainWindow* _main = new QMainWindow();
 
    QDockWidget* _table = new QDockWidget(_main);
    _table->setObjectName("table");
    _main->addDockWidget(Qt::RightDockWidgetArea, _table);
 
    _main->show();
 
    _main->restoreState(); // only restore state **after** showing the window
}

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