scenario:
Before this commit the viewport of the new/empty file was not remembered.
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FUU6DZUQTL3I63UYXIGCTAURD7IUOILJIUNQF3AZCFYYGTFDDSPAC
6IUXRCAHMEKG5JNNQBZUIUB3F4GC2CKXZRVBBLCEQ2OWGSJCRFBQC
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G3BXMS443XKMPFLASCQHZJTEZJYWJ4Z64U62RAIF2W7NHUNPFEMQC
if Settings[Filename] then set_viewport(Settings[Filename].viewport) end
if Settings[Filename] then
set_viewport(Settings[Filename].viewport)
end