Warning when dynamically recreating a QGridLayout

Hello,

The goal of my class MyDialog is to display dynamically 2 or 10 checkboxes using a gridlayout. If the number of checkboxes changes, first
I empty the gridlayout (function clearLayout) and then I insert the desired number of checkboxes.

Unfortunately an annoying warning is displayed (I use qt 5.7 on windows) after the call of adjustSize():

Quote:

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setGeometry: Unable to set geometry 22x22+2481+481 on QWidgetWindow/'MyDialogClassWindow'. Resulting geometry: 95x22+2481+481 (frame: 8, 30, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 22x22, maximum size: 16777215x16777215).

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Do you understand why there is such a warning ?
Thank you

Code:

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#include "mydialog.h"
 
MyDialog::MyDialog()
    :QDialog()
{
    _value = 2;
    _layout = new QGridLayout;
    setLayout(_layout);
    createDisplay();
}
 
MyDialog::~MyDialog(){}
 
// remove all the widgets of layout
void MyDialog::clearLayout(QLayout* layout)
{
    if(!layout) return;
    while (QLayoutItem* item = layout->takeAt(0))
    {
        if (QWidget* widget = item->widget()){
            widget->deleteLater();
        }
 
        if (QLayout* childLayout = item->layout())
            clearLayout(childLayout);
        delete item;
    }
}
 
void MyDialog::createDisplay()
{
    clearLayout(layout());
 
    _comboBoxType = new QComboBox();
    _comboBoxType->addItem("2", 2);
    _comboBoxType->addItem("10", 10);
    if(_value == 2)
    {
        _comboBoxType->setCurrentIndex(0);
    }else
    {
        _comboBoxType->setCurrentIndex(1);
    }
    _layout->addWidget(_comboBoxType, 0, 0);
    connect(_comboBoxType, SIGNAL(currentIndexChanged(int)), this, SLOT(setValue()));
 
    for(int i=0; i<_value; ++i)
    {
        QCheckBox *w = new QCheckBox("Value :", this);
        _layout->addWidget(w, i+1, 0);
    }
    adjustSize();
}
 
void MyDialog::setValue()
{
    _value = _comboBoxType->currentData().toInt();
    createDisplay();
}

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Attachment 12232
Attachment 12233