When performing AutoFill on a series of numbers Calc should continue this series
according to a numerical trend (linear or growth). 

For example:

cell A1 = 5
cell A2 = 12
cell A3 = 13
cell A4 = 20
cell A5 = 24

Select the range A1:A5 and pull down the AutoFill handle to A10. According to a
linear trend the result should be:

cell A6 = 28,6
cell A7 = 33,2
cell A8 = 37,8
cell A9 = 42,4
cell A10 = 47

(This is exactliy what MS Excel is showing.)

However, OOo Calc is showing:

cell A6 = 6
cell A7 = 13
cell A8 = 14
cell A9 = 21
cell A10 = 25

Suggestion: Take over the competitor´s behaviour, since this is a lot more
usefull and this is what most users would expect.

(See Issue #74662 about how to provide options for deciding what type of trend
has to be applied (linear, growth).)