Fix a few minor symbol library inheritance bugs.

Don't clobber value file when load aliases in legacy symbol library cache
parser.

Use actual symbol library LIB_PART pointer rather than a flattened copy
of the symbol.  This fixed a bug when displaying the parent field in the
message panel for derived symbols.

Simplify the flatten code by copying the parent and updating the lesser
information from the inherited symbol.

eeschema/class_libentry.cpp

@@ -277,39 +277,17 @@ std::unique_ptr< LIB_PART > LIB_PART::Flatten() const
         wxCHECK_MSG( parent, retv,
                      wxString::Format( "Parent of derived symbol '%s' undefined", m_name ) );
 
-        retv.reset( new LIB_PART( *const_cast< LIB_PART* >( this ) ) );
+        // Copy the parent.
+        retv.reset( new LIB_PART( *const_cast< LIB_PART* >( parent.get() ) ) );
 
-        // Flattened symbols have no inheritance.
+        // Now add the inherited part (this) information.
-        retv->SetParent( nullptr );
+        retv->SetName( m_name );
 
-        // Flatten parent information into the derived symbol.
+        const LIB_FIELD* datasheetField = GetField( DATASHEET );
-        retv->SetUnitCount( parent->GetUnitCount() );
+        retv->GetField( DATASHEET )->SetText( datasheetField->GetText() );
-
+        retv->SetDocFileName( m_docFileName );
-        LIB_ITEM* newItem;
+        retv->SetKeyWords( m_keyWords );
-
+        retv->SetDescription( m_description );
-        for( LIB_ITEM& item : parent->GetDrawItems() )
-        {
-            // Only add fields from the parent that are not present in the child.  The child
-            // symbol fields are already set.
-            if( item.Type() == LIB_FIELD_T )
-            {
-                LIB_FIELD* field = (LIB_FIELD*) &item;
-
-                if( retv->GetField( field->GetId() ) )
-                    continue;
-            }
-
-            newItem = (LIB_ITEM*) item.Clone();
-            newItem->SetParent( retv.get() );
-            retv->GetDrawItems().push_back( newItem );
-        }
-
-        if( parent->IsPower() )
-            retv->SetPower();
-        else
-            retv->SetNormal();
-
-        retv->LockUnits( parent->UnitsLocked() );
     }
     else
     {
@@ -803,9 +781,9 @@ void LIB_PART::GetFields( LIB_FIELDS& aList )
 }
 
 
-LIB_FIELD* LIB_PART::GetField( int aId )
+LIB_FIELD* LIB_PART::GetField( int aId ) const
 {
-    for( LIB_ITEM& item : m_drawings[ LIB_FIELD_T ] )
+    for( const LIB_ITEM& item : m_drawings[ LIB_FIELD_T ] )
     {
         LIB_FIELD* field = ( LIB_FIELD* ) &item;
 
@@ -876,6 +854,15 @@ bool LIB_PART::HasConversion() const
             return true;
     }
 
+    if( PART_SPTR parent = m_parent.lock() )
+    {
+        for( const LIB_ITEM& item : parent->GetDrawItems() )
+        {
+            if( item.m_Convert > LIB_ITEM::LIB_CONVERT::BASE )
+                return true;
+        }
+    }
+
     return false;
 }
 

eeschema/class_libentry.h

@@ -271,7 +271,7 @@ public:
      * @param aId - Id of field to return.
      * @return The field if found, otherwise NULL.
      */
-    LIB_FIELD* GetField( int aId );
+    LIB_FIELD* GetField( int aId ) const;
 
     /** Return reference to the value field. */
     LIB_FIELD& GetValueField();

eeschema/sch_legacy_plugin.cpp

@@ -2896,9 +2896,13 @@ void SCH_LEGACY_PLUGIN_CACHE::loadAliases( std::unique_ptr<LIB_PART>& aPart,
 
                 if( field->GetId() < MANDATORY_FIELDS )
                 {
+                    // Get all of the parent field information except for the string.
                     *newPart->GetField( field->GetId() ) = *field;
 
-                    if( field->GetId() == REFERENCE || field->GetId() == FOOTPRINT )
+                    // Restore the alias strings that are defined in this file format.
+                    if( field->GetId() == REFERENCE
+                      || field->GetId() == FOOTPRINT
+                      || field->GetId() == VALUE )
                         newPart->GetField( field->GetId() )->SetText( tmp );
                 }
             }

eeschema/sch_view.cpp

@@ -135,9 +135,7 @@ void SCH_VIEW::DisplayComponent( LIB_PART* aPart )
     std::shared_ptr< LIB_PART > parent;
     LIB_PART* drawnPart = aPart;
 
-    if( aPart->IsAlias() )
+    // Draw the mandatory fields for aliases and parent symbols.
-    {
-        // Draw the alias mandatory fields.
     for( auto& item : aPart->GetDrawItems() )
     {
         if( item.Type() != LIB_FIELD_T )
@@ -149,6 +147,9 @@ void SCH_VIEW::DisplayComponent( LIB_PART* aPart )
             Add( &item );
     }
 
+    // Draw the parent items if the symbol is inherited from another symbol.
+    if( aPart->IsAlias() )
+    {
         parent = aPart->GetParent().lock();
 
         wxCHECK( parent, /* void */ );
@@ -158,12 +159,12 @@ void SCH_VIEW::DisplayComponent( LIB_PART* aPart )
 
     for( auto& item : drawnPart->GetDrawItems() )
     {
-        // Do not overwrite the alias mandatory fields with the parent mandatory fields.
+        // The mandatory fields are already in place so we only add user defined fields.
         if( item.Type() == LIB_FIELD_T )
         {
             LIB_FIELD* field = (LIB_FIELD*) &item;
 
-            if( aPart->IsAlias() && field->GetId() < MANDATORY_FIELDS )
+            if( field->GetId() < MANDATORY_FIELDS )
                 continue;
         }
 

eeschema/toolbars_viewlib.cpp

@@ -146,7 +146,7 @@ void LIB_VIEW_FRAME::ReCreateMenuBar()
 
 void LIB_VIEW_FRAME::SyncToolbars()
 {
-    std::unique_ptr< LIB_PART > symbol( GetSelectedSymbol() );
+    LIB_PART* symbol = GetSelectedSymbol();
 
     m_mainToolBar->Toggle( EE_ACTIONS::showDatasheet,
                            symbol && !symbol->GetDocFileName().IsEmpty() );

eeschema/tools/ee_inspection_tool.cpp

@@ -252,8 +252,7 @@ int EE_INSPECTION_TOOL::ShowDatasheet( const TOOL_EVENT& aEvent )
     }
     else if( m_frame->IsType( FRAME_SCH_VIEWER ) || m_frame->IsType( FRAME_SCH_VIEWER_MODAL ) )
     {
-        std::unique_ptr< LIB_PART > entry =
+        LIB_PART* entry = static_cast<LIB_VIEW_FRAME*>( m_frame )->GetSelectedSymbol();
-                static_cast<LIB_VIEW_FRAME*>( m_frame )->GetSelectedSymbol();
 
         if( !entry )
             return 0;

eeschema/tools/lib_control.cpp

@@ -373,7 +373,7 @@ int LIB_CONTROL::AddSymbolToSchematic( const TOOL_EVENT& aEvent )
         }
         else
         {
-            part = viewFrame->GetSelectedSymbol().get();
+            part = viewFrame->GetSelectedSymbol();
             libId = part->GetLibId();
             unit = viewFrame->GetUnit();
             convert = viewFrame->GetConvert();

eeschema/viewlib_frame.cpp

@@ -207,7 +207,7 @@ LIB_VIEW_FRAME::LIB_VIEW_FRAME( KIWAY* aKiway, wxWindow* aParent, FRAME_T aFrame
 LIB_VIEW_FRAME::~LIB_VIEW_FRAME()
 {
     if( m_previewItem )
-        GetCanvas()->GetView()->Remove( m_previewItem.get() );
+        GetCanvas()->GetView()->Remove( m_previewItem );
 }
 
 
@@ -248,17 +248,12 @@ void LIB_VIEW_FRAME::SetUnitAndConvert( int aUnit, int aConvert )
 }
 
 
-std::unique_ptr< LIB_PART > LIB_VIEW_FRAME::GetSelectedSymbol() const
+LIB_PART* LIB_VIEW_FRAME::GetSelectedSymbol() const
 {
-    std::unique_ptr< LIB_PART > symbol;
+    LIB_PART* symbol = nullptr;
 
     if( !m_libraryName.IsEmpty() && !m_entryName.IsEmpty() )
-    {
+        symbol = Prj().SchSymbolLibTable()->LoadSymbol( m_libraryName, m_entryName );
-        LIB_PART* tmp = Prj().SchSymbolLibTable()->LoadSymbol( m_libraryName, m_entryName );
-
-        if( tmp )
-            symbol = tmp->Flatten();
-    }
 
     return symbol;
 }
@@ -266,12 +261,12 @@ std::unique_ptr< LIB_PART > LIB_VIEW_FRAME::GetSelectedSymbol() const
 
 void LIB_VIEW_FRAME::updatePreviewSymbol()
 {
-    std::unique_ptr< LIB_PART > symbol = GetSelectedSymbol();
+    LIB_PART* symbol = GetSelectedSymbol();
     KIGFX::SCH_VIEW* view = GetCanvas()->GetView();
 
     if( m_previewItem )
     {
-        view->Remove( m_previewItem.get() );
+        view->Remove( m_previewItem );
         m_previewItem = nullptr;
     }
 
@@ -282,8 +277,8 @@ void LIB_VIEW_FRAME::updatePreviewSymbol()
         GetRenderSettings()->m_ShowUnit = m_unit;
         GetRenderSettings()->m_ShowConvert = m_convert;
 
-        m_previewItem.reset( symbol.release() );
+        m_previewItem = symbol;
-        view->Add( m_previewItem.get() );
+        view->Add( m_previewItem );
 
         wxString parentName = _( "<none>" );
         std::shared_ptr< LIB_PART > parent  = m_previewItem->GetParent().lock();
@@ -370,7 +365,7 @@ void LIB_VIEW_FRAME::OnSize( wxSizeEvent& SizeEv )
 
 void LIB_VIEW_FRAME::onUpdateUnitChoice( wxUpdateUIEvent& aEvent )
 {
-    std::unique_ptr< LIB_PART > part = GetSelectedSymbol();
+    LIB_PART* part = GetSelectedSymbol();
 
     int unit_count = 1;
 
@@ -701,7 +696,7 @@ void LIB_VIEW_FRAME::SetFilter( const SCHLIB_FILTER* aFilter )
 
 const BOX2I LIB_VIEW_FRAME::GetDocumentExtents() const
 {
-    std::unique_ptr< LIB_PART > part = GetSelectedSymbol();
+    LIB_PART* part = GetSelectedSymbol();
 
     if( !part )
     {
@@ -709,9 +704,14 @@ const BOX2I LIB_VIEW_FRAME::GetDocumentExtents() const
     }
     else
     {
-        EDA_RECT bbox = part->GetUnitBoundingBox( m_unit, m_convert );
+        std::shared_ptr< LIB_PART > tmp;
-        return BOX2I( bbox.GetOrigin(), VECTOR2I( bbox.GetWidth(), bbox.GetHeight() ) );
 
+        tmp = ( part->IsAlias() ) ? part->GetParent().lock() : part->SharedPtr();
+
+        wxCHECK( tmp, BOX2I( VECTOR2I(-200, -200), VECTOR2I( 400, 400 ) ) );
+
+        EDA_RECT bbox = tmp->GetUnitBoundingBox( m_unit, m_convert );
+        return BOX2I( bbox.GetOrigin(), VECTOR2I( bbox.GetWidth(), bbox.GetHeight() ) );
     }
 }
 

eeschema/viewlib_frame.h

@@ -137,7 +137,7 @@ public:
     int GetUnit() const { return m_unit; }
     int GetConvert() const { return m_convert; }
 
-    std::unique_ptr< LIB_PART > GetSelectedSymbol() const;
+    LIB_PART* GetSelectedSymbol() const;
 
     const BOX2I GetDocumentExtents() const override;
 
@@ -190,7 +190,7 @@ private:
      */
     bool m_selection_changed;
 
-    std::unique_ptr< LIB_PART > m_previewItem;
+    LIB_PART* m_previewItem;
 
     DECLARE_EVENT_TABLE()
 };

eeschema/viewlibs.cpp

@@ -55,7 +55,7 @@ void LIB_VIEW_FRAME::OnSelectSymbol( wxCommandEvent& aEvent )
     const auto libNicknames = libs->GetLogicalLibs();
     adapter->AddLibraries( libNicknames, this );
 
-    std::unique_ptr< LIB_PART > current( GetSelectedSymbol() );
+    LIB_PART* current = GetSelectedSymbol();
     LIB_ID id;
     int unit = 0;