[REVIEW 3-6] Proper placements of complex categories (fdo#55298)

[Kohei Yoshida]

Hi there,

Here is another request for backport related to chart.

I'd like

http://cgit.freedesktop.org/libreoffice/core/commit/?id=8baaff5c798984b0fa7fe7a764491ca27765623e

backported to 3-6 to fix

https://bugs.freedesktop.org/show_bug.cgi?id=55298

Our chart code currently treats both empty cell values as well as 
repeated values equally and interpret them as continuation of the 
previous categories.  But this creates an interoperability issue with 
Excel's chart engine which treats the latter case differently.  This 
commit improves the situation there.

Review and backport would be appreciated.

Thanks,

Kohei

-- 
Kohei Yoshida, LibreOffice hacker, Calc