QtCreator's QtSingleApplication not so single?!

Pl45m4

I've been digging QtCreator's source code for quite some time to see how some things work, how they are implemented and to get some inspiration :)
So far, so good.
QtC's app instance is a QtSingleApplication, which, AFAIK, should prevent the user from starting multiple instances of the program at the same time?! Right?!

GitHub-Source

But I'm able to create a bazillion instances of QtCreator...

Am I misinterpreting something or is this not working as expected?
As long as I can remember, it was possible to start QtCreator multiple times?!

cristian-adam

Start Qt Creator with the -client command line argument to open the first instance of Qt Creator.

Christian Ehrlicher

Just because you inherit from this class doesn't mean you can't start more than once.

Pl45m4

@cristian-adam

Now it behaves like expected :)

@Christian-Ehrlicher I'm not after to reproduce this behavior in my app, I just stumbled upon this part in the code of QtC and thought about it. Because you can usually open multiple instances of QtCreator at the same time.
So you need extra arguments to activate the single App behavior... I did not know that :)