Bugfix: NNs not found due to precision error.

modules/text/src/erfilter.cpp

@@ -1766,7 +1766,9 @@ static void NN_chain_core(const int_fast32_t N, double * const D, t_members * co
 
             for (i=active_nodes.start; i<idx2; i=active_nodes.succ[i])
             {
-                if (D_(i,idx2) < min)
+                // Need double_equal check because of some numerical imprecision
+                // in construction of D_.
+                if (D_(i,idx2) < min && !double_equal(D_(i,idx2), min))
                 {
                     min = D_(i,idx2);
                     idx1 = i;
@@ -1774,7 +1776,7 @@ static void NN_chain_core(const int_fast32_t N, double * const D, t_members * co
             }
             for (i=active_nodes.succ[idx2]; i<N; i=active_nodes.succ[i])
             {
-                if (D_(idx2,i) < min)
+                if (D_(idx2,i) < min && !double_equal(D_(i,idx2), min))
                 {
                     min = D_(idx2,i);
                     idx1 = i;