[okular] [Bug 436738] docdata duplicated each time pdf is edited

[Albert Astals Cid]

https://bugs.kde.org/show_bug.cgi?id=436738

--- Comment #16 from Albert Astals Cid <aacid at kde.org> ---
> The SHA algorithms don’t make collisions that we should care about. :)

I don't understand what you mean with this?

> For PDF, the hash of filesize + a couple of 4kB chunks throughout the file would surely be good enough. For some formats I can imagine users might want to change small bits of the file in a way this can't detect, but PDF isn't one of them.

So I open a file, add an annotation, save it as filea.pdf then move the
annotation around and save it as fileb.pdf. Your algorithm would think it's the
same file

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