https://bugs.documentfoundation.org/show_bug.cgi?id=92419

--- Comment #27 from Cor Nouws <c...@nouenoff.nl> ---
Hi Ferdinand,

(In reply to Ferdinand from comment #16)
> Sorry I do not understand this reasoning in comment 15
> 
> the referenced cell shows the error immediately (given automatic calc is on) 
> if in addition to the error in the cell a pop up is triggered with the undo
> option it would solve the problem without noticeable delay. 
That sounds as if it is easier to implement, without the negative effects on
performance, and other trouble that @erack explained.
But I doubt it really is simpler, because it still would be necessary not only
do the changes invoked by a user action (which in done automatically, unless it
is turned off) to track if one or more of the changes indeed are invalidated
results, that then would trigger the popup. The latter is simple, but the step
before.. Eike, if you could be so kind to give your expert input on this..

(In reply to Ferdinand from comment #23/25)
> we do get a warning if we want to past new content into cells with content
> we also should get a warning if referenced cells are removed
That could be a completely different approach?
Such as: I delete some content for the first time, then a popup tells me: "are
you really sure, you may break formulas .. etc" ?
But rather generic, probably panicking inexperienced users. And how to act on
editing cell contents?

How much I like (or not, as a professional trainer ;) ) the idea to prevent
users doing stupid things, I still see no workable solution for this..

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