[Coin-discuss] OsiClp branchAndBound changes state of model

[Matthew Galati]

The following workflow is not doing what I expected.

1 OsiClp o;
2 o.loadProblem(...)
3 o.branchAndBound();
4 o.addRow();
5 o.branchAndBound();

After 3, the model seems to be changed - for example, a bunch of columns
are fixed to 0 and some are fixed to 1. Presumably presolve or the reduced
model in the tree at the end of solve.

So, when I add my row, I am no longer working with the original model.

Bug? Expected behavior?

How does one go about doing what I want - which is: solve, add a row, solve
again.
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