[Qt-interest] 6 second delay after destruction of QMainWindow subclass

[Stephen Collyer]

I have code which constructs an auto object which is subclassed from
QMainWindow. Logging shows me that there is a 6 second delay after the
object's destructor runs, when the program terminates.

The code in skeleton looks like:

try
{
    QApplication app(argc, argv);

    MainWindowClass m;

    <construct other objects>
    ...
}
catch(..)
{
  ..
}

<some logging>
exit(0);

The MainWindowClass object is the last object destroyed when control leaves
the try block.
Can anyone suggest what's going on here ?

-- 
Stephen Collyer
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