Hi there,

I'm using FileChooserDialog to generate a "Save As" dialog. I would like to 
have the file extension appended to the end of the file name. 

Initially, I thought I could simply use FileChooser::GetFilter to retrieve the 
currently selected filter after the user clicks "Save As". However, this 
returns me a null pointer instead. Is there an event I can connect to so that I 
can get the current FileFilter before it is destroyed? Alternatively, it would 
be nice to have a signal exposed so I can catch FileFilter changes with my own 
handler.

Thanks,
Soo Wei
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