Steps to reproduce:
Create a new spreadsheet
A1 = 1
A2 = 2
A3 = 3
A4 = 4
A5 = "=SUM(A1:A4)"
-> A5 is calculated as 10 (correctly)
Select A1:A2 and press delete key
-> A5 is calculated as 7 (correctly)
Use Ctrl-Z to undo.
-> A5 is not recalculated, still says 7 (incorrectly)
Same behaviour with Edit->Delete Contents(all) + Edit->Undo
Tested on Ubuntu 14.04 (126.96.36.199 x86-64) and Windows 7 (188.8.131.52 x86).
Please if you are not agree, reopen it.
*** This bug has been marked as a duplicate of bug 80846 ***
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