[evince] Change last opened documents capacity, how?

[Rares Aioanei <schaiba gmail com>]

Hello,

I browsed the evince source code the last few hours but couldn't find 
what I need: in the File menu, one can see the last five opened files. 
How can I increase that number so Evince will "remember" more than five?

Thanks in advance,

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Rares Aioanei