Changing default "is_merged" status for Edges and Region to false.

This was a problem with universal DRC which does not specifically
set the merged status. Furthermore, the default for DeepRegion and
DeepEdges was "false" already and now is aligned.

src/db/db/dbFlatEdges.cc

@@ -82,7 +82,7 @@ void FlatEdges::invalidate_cache ()
 
 void FlatEdges::init ()
 {
-  m_is_merged = true;
+  m_is_merged = false;
   m_merged_edges_valid = false;
 }
 
@@ -321,9 +321,7 @@ const db::RecursiveShapeIterator *FlatEdges::iter () const
 void
 FlatEdges::do_insert (const db::Edge &edge)
 {
-  if (! empty ()) {
-    m_is_merged = false;
-  }
+  m_is_merged = empty ();
 
   mp_edges->insert (edge);
   invalidate_cache ();

src/db/db/dbFlatRegion.cc

@@ -82,7 +82,7 @@ void FlatRegion::invalidate_cache ()
 
 void FlatRegion::init ()
 {
-  m_is_merged = true;
+  m_is_merged = false;
   m_merged_polygons_valid = false;
 }
 

src/db/db/dbOriginalLayerEdges.cc

@@ -270,7 +270,7 @@ OriginalLayerEdges::less (const Edges &other) const
 void
 OriginalLayerEdges::init ()
 {
-  m_is_merged = true;
+  m_is_merged = false;
   m_merged_edges_valid = false;
 }
 

src/db/db/dbOriginalLayerRegion.cc

@@ -382,7 +382,7 @@ OriginalLayerRegion::less (const Region &other) const
 void
 OriginalLayerRegion::init ()
 {
-  m_is_merged = true;
+  m_is_merged = false;
   m_merged_polygons_valid = false;
 }
 

src/drc/unit_tests/drcSimpleTests.cc

@@ -1318,3 +1318,13 @@ TEST(54_issue1011)
   run_test (_this, "54", false);
 }
 
+TEST(55_drccount)
+{
+  run_test (_this, "55", false);
+}
+
+TEST(55d_drccount)
+{
+  run_test (_this, "55", true);
+}
+