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Yikes. LibreOffice Calc will let you to open 2 copies of the same file at the same time.

Then it gives a cryptic error message about "another user editing the same file" when you try to save conflicting changes.

Not sure if this is a bug. But it feels like a bug.

Typically if I accidentally double-click on the same file to open it, I'd expect the software to transparently pop up the already-open one, not transparently open a second copy full of destructive potential...