[REVIEW 3-6] fdo#55418

[Noel Power]

This one was quite hard to reproduce. The problem is that the 'xfId' 
written out for the cellstyle is sometimes incorrect, worse of course 
was that mostly it was correct. Additionally just to improve the 
debugging experience the way the lists get laid out it seems even when 
it didn't work it could produce the most bizarre results or even 
something nearly correct ( like perhaps one cell out of twenty with the 
wrong format ) :-)

the patch to cherry-pick is 
http://cgit.freedesktop.org/libreoffice/core/commit/?id=a705c6cac4182d62c3495be7367d4ae34fd47fac

Noel

p.s. the situation isn't imo quite correct yet, at least when looking at 
the exported document in excel even though the correct combination of 
cell attributes is applied excel doesn't seem to recognise the exported 
custom style ( e.g. in the bugdoc the style is a custom 'Date' style, in 
the end excel seems to recognise it as "TableStyleLight" ) This though 
is a pre-existing problem