Function SCIPgetFocusNode 

pub unsafe extern "C" fn SCIPgetFocusNode(
    scip: *mut SCIP,
) -> *mut SCIP_NODE

gets focus node in the tree

if we are in probing/diving mode this method returns the node in the tree where the probing/diving mode was started.

@return the current node of the search tree

@pre This method can be called if @p scip is in one of the following stages: - \ref SCIP_STAGE_INITPRESOLVE - \ref SCIP_STAGE_PRESOLVING - \ref SCIP_STAGE_EXITPRESOLVE - \ref SCIP_STAGE_SOLVING