diff --git a/src/db/db/dbEdgesUtils.cc b/src/db/db/dbEdgesUtils.cc
index 4558e53ed..df0ca4dfd 100644
--- a/src/db/db/dbEdgesUtils.cc
+++ b/src/db/db/dbEdgesUtils.cc
@@ -297,7 +297,7 @@ bool edge_is_outside (const db::Edge &a, const db::Edge &b)
       //  no intersection -> outside
       return true;
     }
-    return ! b.contains_excl (pt.second);
+    return ! b.contains_excl (pt.second) || ! a.contains_excl (pt.second);
   }
 }
 
diff --git a/src/db/unit_tests/dbDeepEdgesTests.cc b/src/db/unit_tests/dbDeepEdgesTests.cc
index 8aa2c6e57..4b6e9b89c 100644
--- a/src/db/unit_tests/dbDeepEdgesTests.cc
+++ b/src/db/unit_tests/dbDeepEdgesTests.cc
@@ -708,8 +708,14 @@ TEST(11_SelectedInsideWithEdges)
   EXPECT_EQ (db::compare (e.selected_inside (eeflat), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
   EXPECT_EQ (db::compare (eflat.selected_inside (ee), "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
   EXPECT_EQ (db::compare (e.selected_not_inside (ee), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_inside (eeflat), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_not_inside (ee), "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (ee).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (eeflat).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_inside_differential (ee).first, "(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1600,-800;1600,-200)"), true);
   EXPECT_EQ (db::compare (e.selected_inside_differential (ee).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_inside_differential (eeflat).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_inside_differential (ee).second, "(0,0;0,1000);(100,0;100,3000);(1100,-1000;1100,2000);(1500,1000;1500,2100);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
 }
 
 TEST(12_SelectedOutsideWithRegion)
@@ -761,9 +767,17 @@ TEST(12_SelectedOutsideWithRegion)
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (r).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (r).second, ""), true);
   EXPECT_EQ (db::compare (e.selected_outside (r), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside (rflat), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_outside (r), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_not_outside (r), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (rflat), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_not_outside (r), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (r).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (rflat).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_outside_differential (r).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
   EXPECT_EQ (db::compare (e.selected_outside_differential (r).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (rflat).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_outside_differential (r).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
 }
 
 TEST(13_SelectedOutsideWithEdges)
@@ -818,9 +832,17 @@ TEST(13_SelectedOutsideWithEdges)
   EXPECT_EQ (db::compare (db::Edges ().selected_not_outside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (ee).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (ee).second, ""), true);
-  EXPECT_EQ (db::compare (e.selected_outside (ee), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside (ee), "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside (eeflat), "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_outside (ee), "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (eeflat), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).first, "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (eeflat).first, "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_outside_differential (ee).first, "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (eeflat).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (eflat.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
 }
 
diff --git a/src/db/unit_tests/dbEdgesTests.cc b/src/db/unit_tests/dbEdgesTests.cc
index a3073dc6d..8be4995f7 100644
--- a/src/db/unit_tests/dbEdgesTests.cc
+++ b/src/db/unit_tests/dbEdgesTests.cc
@@ -1107,10 +1107,10 @@ TEST(27)
   EXPECT_EQ (db::compare (db::Edges ().selected_not_outside (ee), ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (ee).first, ""), true);
   EXPECT_EQ (db::compare (db::Edges ().selected_outside_differential (ee).second, ""), true);
-  EXPECT_EQ (db::compare (e.selected_outside (ee), "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).first, "(0,0;0,1000);(100,0;100,3000);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
-  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200);(1700,1500;1600,2500)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside (ee), "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_not_outside (ee), "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).first, "(0,0;0,1000);(100,0;100,3000);(1700,1500;1600,2500);(1800,2500;1800,3500);(-1500,0;-1500,1000)"), true);
+  EXPECT_EQ (db::compare (e.selected_outside_differential (ee).second, "(1100,-1000;1100,2000);(1200,-1000;1200,0);(1300,-800;1300,-200);(1400,1000;1400,1100);(1500,1000;1500,2100);(1600,-800;1600,-200)"), true);
 }
 
 //  GitHub issue #72 (Edges/Region NOT issue)
diff --git a/src/db/unit_tests/dbEdgesUtilsTests.cc b/src/db/unit_tests/dbEdgesUtilsTests.cc
index 7808903cc..e523e114f 100644
--- a/src/db/unit_tests/dbEdgesUtilsTests.cc
+++ b/src/db/unit_tests/dbEdgesUtilsTests.cc
@@ -71,6 +71,7 @@ TEST(1)
   EXPECT_EQ (db::edge_is_outside (db::Edge (db::Point (0, 0), db::Point (10, 10)), db::Edge (db::Point (0, 0), db::Point (0, 20))), true);
   EXPECT_EQ (db::edge_is_outside (db::Edge (db::Point (0, 0), db::Point (10, 10)), db::Edge (db::Point (1, 1), db::Point (20, 20))), false);
   EXPECT_EQ (db::edge_is_outside (db::Edge (db::Point (0, 0), db::Point (10, 10)), db::Edge (db::Point (30, 30), db::Point (20, 20))), true);
+  EXPECT_EQ (db::edge_is_outside (db::Edge (db::Point (1700, 1500), db::Point (1600, 2500)), db::Edge (db::Point (1700, 1000), db::Point (1700, 2000))), true);
 
   EXPECT_EQ (db::edge_is_outside (db::Edge (db::Point (0, 0), db::Point (10, 10)), db::Polygon ()), true);
   EXPECT_EQ (db::edge_is_outside (db::Edge (db::Point (0, 0), db::Point (10, 10)), db::Polygon (db::Box (0, 0, 10, 10))), false);