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Fix 2109 #2113

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Fix 2109 #2113

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@jajhall jajhall commented Jan 8, 2025

Now running postsolve after model status of LP reduced by presolve is unknown. This fixes the bug exposed by #2109 but means that postsolve is working with a non-optimal solution. Since there's no guarantee that an optimal solution remains so through postsolve, I guess it doesn't matter, and can lead to HiGHS finding a definitive model status for LPs whose reduced LP did not have such a status.

…P is kUnknown, and hence clearing EKK for the (strictly) reduced LP
…(model_status_) now called immediately after solveLp for strictly reduced LP: simplification of later code
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jajhall commented Jan 8, 2025

Closes #2109

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