[PD] dirty flag + donecanvasdialog = false

[João Pais]

Hi,

I was working on a dynamic GUI abstraction that rescales itself when  
created, and noticed that donecanvasdialog makes the patches go dirty.  
since these abs go dirty at time of creation, they remain dirty until the  
main patch eventually closes. That creates problemas, because when the  
main patch is closing, it asks if changes should be saved as many times as  
the abstractions were used. And if changes aren't saved, pd just  
crashes/hangs up indefinitely, until forced to shut down.

I don't know all uses of donecanvasdialog, but if one of its uses is to  
allow for dynamic GUI patches to be used, it might make sense to remove  
the dirty flag activation. That might be easier to do than add another  
choice in the canvas properties, so that dirty flag doesn't get activated  
(I guess).

Best,

João Pais

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