https://bugs.documentfoundation.org/show_bug.cgi?id=115012
--- Comment #6 from Aron Budea <[email protected]> ---
Some comments from Markus on IRC:
<@moggi> the behavior, it is not the chart side but the calc side that forces
us to interpret ="" as empty
<@moggi> implemented in ScChart2DataSequence::BuildDataCache
<bearon> this will return false, right? pFCell->IsValue()
<@moggi> yes
<@moggi> well, it would require to pass the missing value treatment to the sc
chart data provider as this requires to treat cache items with Item::mbIsValue
== false and Item::maString.isEmpty() == true as 0
<@moggi> currently it is NaN
<bearon> apart from this problem, is extending the mentioned
MissingValueTreatment.idl with an "OOXML-specific" value an acceptable change?
<@moggi> I would need to ask sberg what the rules are about published constants
<@moggi> if extending them is considered API breaking this would be a much
bigger task as that would require to replace the chart1 API constants with a
new chart2 API constant group
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