Gui hangs when close button is clicked

[Jonny174]

#include <QApplication>
 
connect(ui->Close, SIGNAL(clicked()), qApp, SLOT(quit()));
 
or
 
connect(ui->Close, SIGNAL(clicked()), qApp, SLOT(closeAllWindows()));

#include <QApplication>

connect(ui->Close, SIGNAL(clicked()), qApp, SLOT(quit()));

or

connect(ui->Close, SIGNAL(clicked()), qApp, SLOT(closeAllWindows()));

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