[BUG]export picture double extention

When i try to export an uml diagram and, the automatically select name 
extention feature is on, umbrello add twice the extention.


My request are: to check if file name has allready the extention before adding 
it, change the .jpeg suffix in .jpg.


regards.
   

-- 
>here are more things in heaven and earth,
horatio, than are dreamt of in your philosophy.


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