Catch #REF! error - issue of a warning is necessary - with working PATCH now

[ferdiga]

I created a new post with a link to a working patch (as I can not reopen the old one)

issue a warning if a delete cell or page operation causes a reference error

Catch #REF! error - issue of a warning is necessary

If a referenced cell is deleted (delete row, column, sheet) the referencing cells show #REF! - no warning is issued. technically this is OK, but frustrating for users, as this error is often only detected much later and reconstruction of the sheet is cumbersome if possible at all. Any ideas?