[Libreoffice] [Patch] [Review 3.5 - Late Feature] Improved copying between different calc documents

[Markus Mohrhard]

Hello Eike,

> We talked about that before Christmas (actually I thought that would be
> already in 3-5 now), and yes, this feature makes sense when copying
> between documents.

After I had to enable the external references to unsaved documents
through direct input I was not sure if it is not a new feature.

> So, approval from me, but apparently at least some
> quirk pointed out by Cor lately needs to be solved.
>

I think I finally have an idea how Cor managed to create that file. I
think we are still missing one warning message if you close an unsaved
file which is still referenced by another file. At this moment this
ref is invalid. I'll adda warning message in this case and will insert
Kohei's suggestions.

Thanks for your reviews.