I'm trying to change the size of a floating dock from within the code (think: button "show details").

I've come up with the following, trying various combinations of this, on my custom widget and the parent dock widget:

    //this->resize(400, 300);
    //this->setFixedSize(400,300);
    //this->updateGeometry();
    //this->show();
    //this->update();

    if (dockWidget->isFloating() {
      //dockWidget->resize(400, 300);
      dockWidget->setFixedSize(400,300);
      //dockWidget->updateGeometry();
      dockWidget->show();
      dockWidget->update();
    }

all this does is change the size of my custom widget inside the dock, but never the size of the dock.

Any suggestion on how to do this?