Quit-application-action-with-do-no-show-again-option

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Usually applications have a Quit action in the context menu,
The following code will show a question dialog to the user to make sure that (s)he really wants to quit.
There is also an option to supress this message.

To reenable this message you will need to clear the mainwindow/quitWithoutPrompt key trough the default QSettings. The following code can be used do do that:

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