Handle holes when building outlines for copper sliver checker.

Fixes https://gitlab.com/kicad/code/kicad/issues/12797

pcbnew/drc/drc_test_provider_sliver_checker.cpp

@@ -111,11 +111,11 @@ bool DRC_TEST_PROVIDER_SLIVER_CHECKER::Run()
 
     std::vector<SHAPE_POLY_SET> layerPolys( layerCount );
 
-    auto sliver_checker =
-            [&]( int aItem ) -> size_t
+    auto build_layer_polys =
+            [&]( int layerIdx ) -> size_t
             {
-                PCB_LAYER_ID    layer = copperLayers[aItem];
-                SHAPE_POLY_SET& poly = layerPolys[aItem];
+                PCB_LAYER_ID    layer = copperLayers[layerIdx];
+                SHAPE_POLY_SET& poly = layerPolys[layerIdx];
 
                 if( m_drcEngine->IsCancelled() )
                     return 0;
@@ -125,17 +125,13 @@ bool DRC_TEST_PROVIDER_SLIVER_CHECKER::Run()
                 forEachGeometryItem( s_allBasicItems, LSET().set( layer ),
                         [&]( BOARD_ITEM* item ) -> bool
                         {
-                            if( dynamic_cast<ZONE*>( item) )
+                            if( ZONE* zone = dynamic_cast<ZONE*>( item) )
                             {
-                                ZONE* zone = static_cast<ZONE*>( item );
-
                                 if( !zone->GetIsRuleArea() )
                                 {
                                     fill = zone->GetFill( layer )->CloneDropTriangulation();
                                     fill.Unfracture( SHAPE_POLY_SET::PM_FAST );
-
-                                    for( int jj = 0; jj < fill.OutlineCount(); ++jj )
-                                        poly.AddOutline( fill.Outline( jj ) );
+                                    poly.Append( fill );
 
                                     // Report progress on board zones only.  Everything else is
                                     // in the noise.
@@ -173,7 +169,7 @@ bool DRC_TEST_PROVIDER_SLIVER_CHECKER::Run()
     returns.reserve( copperLayers.size() );
 
     for( size_t ii = 0; ii < copperLayers.size(); ++ii )
-        returns.emplace_back( tp.submit( sliver_checker, ii ) );
+        returns.emplace_back( tp.submit( build_layer_polys, ii ) );
 
     for( const std::future<size_t>& ret : returns )
     {

pcbnew/zone.h

@@ -772,6 +772,13 @@ public:
 
 #if defined(DEBUG)
     virtual void Show( int nestLevel, std::ostream& os ) const override { ShowDummy( os ); }
+
+    void SetFillPoly( PCB_LAYER_ID aLayer, SHAPE_POLY_SET* aPoly )
+    {
+        m_FilledPolysList[ aLayer ] = std::make_shared<SHAPE_POLY_SET>( *aPoly );
+        SetFillFlag( aLayer, true );
+    }
+
 #endif
 
     virtual void SwapData( BOARD_ITEM* aImage ) override;