Map nets (if possible) from clipboard to destination.

Fixes: lp:1795057
* https://bugs.launchpad.net/kicad/+bug/1795057

pcbnew/class_board.cpp

@@ -1729,17 +1729,6 @@ D_PAD* BOARD::GetPad( unsigned aIndex ) const
     return nullptr;
 }
 
-void BOARD::ClearAllNetCodes()
-{
-    for( auto zone : Zones() )
-        zone->SetNetCode( 0 );
-
-    for( auto pad : GetPads() )
-        pad->SetNetCode( 0 );
-
-    for( auto track : Tracks() )
-        track->SetNetCode( 0 );
-}
 
 const std::vector<BOARD_CONNECTED_ITEM*> BOARD::AllConnectedItems()
 {
@@ -1767,9 +1756,31 @@ const std::vector<BOARD_CONNECTED_ITEM*> BOARD::AllConnectedItems()
     return items;
 }
 
+
+void BOARD::ClearAllNetCodes()
+{
+    for ( BOARD_CONNECTED_ITEM* item : AllConnectedItems() )
+        item->SetNetCode( 0 );
+}
+
+
+void BOARD::MapNets( const BOARD* aDestBoard )
+{
+    for ( BOARD_CONNECTED_ITEM* item : AllConnectedItems() )
+    {
+        NETINFO_ITEM* netInfo = aDestBoard->FindNet( item->GetNetname() );
+
+        if( netInfo )
+            item->SetNetCode( netInfo->GetNet() );
+        else
+            item->SetNetCode( 0 );
+    }
+}
+
+
 void BOARD::SanitizeNetcodes()
 {
-    for ( auto item : AllConnectedItems() )
+    for ( BOARD_CONNECTED_ITEM* item : AllConnectedItems() )
     {
         if( FindNet( item->GetNetCode() ) == nullptr )
             item->SetNetCode( NETINFO_LIST::ORPHANED );

pcbnew/class_board.h

@@ -1181,6 +1181,13 @@ public:
      */
     void ClearAllNetCodes();
 
+    /**
+     * Map all nets in the given board to nets with the same name (if any) in the destination
+     * board.  This allows us to share layouts which came from the same hierarchical sheet in
+     * the schematic.
+     */
+    void MapNets( const BOARD* aDestBoard );
+
     void SanitizeNetcodes();
 };
 

pcbnew/tools/pcbnew_control.cpp

@@ -584,7 +584,7 @@ int PCBNEW_CONTROL::Paste( const TOOL_EVENT& aEvent )
         return 0;
 
     if( clipItem->Type() == PCB_T )
-        static_cast<BOARD*>( clipItem )->ClearAllNetCodes();
+        static_cast<BOARD*>( clipItem )->MapNets( m_frame->GetBoard() );
 
     bool editModules = m_editModules || frame()->IsType( FRAME_FOOTPRINT_EDITOR );
 
@@ -608,6 +608,9 @@ int PCBNEW_CONTROL::Paste( const TOOL_EVENT& aEvent )
             }
 
             placeBoardItems( static_cast<BOARD*>( clipItem ), true );
+
+            m_frame->Compile_Ratsnest( true );
+            m_frame->GetBoard()->BuildConnectivity();
             break;
         }