[SCIP] SCIPmarkDoNotUpgradeConsLinear

[Luciana Garcia Richter]

Hi,

I was looking an old version of scip which includes function
SCIPmarkDoNotUpgradeConsLinear. But later I realize this function was
removed in the last version. I didn't found any comment about this in the
change log.

There is any reason this function was removed? There is any other way to
force scip to maintain specific constrains?

I'm doing a column generation algorithm, and I need some constraint not
being removed because I need to get the dual value of them (if they get
removed I get a zero when I ask for dual value).

Thanks in advance,
Luciana
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