CADSTAR Schematic Archive Importer: Parse SCALE token in Symbol and warn user this is not supported

Fixes https://gitlab.com/kicad/code/kicad/-/issues/6463

eeschema/sch_plugins/cadstar/cadstar_sch_archive_loader.cpp

@@ -449,6 +449,20 @@ void CADSTAR_SCH_ARCHIVE_LOADER::loadSchematicSymbolInstances()
                        "net power / symbol. The symbol was not loaded." ),
                     sym.ID ) );
         }
+
+        if( sym.ScaleRatioDenominator != 1 || sym.ScaleRatioNumerator != 1 )
+        {
+            wxString symbolName = sym.ComponentRef.Designator;
+
+            if( symbolName.empty() )
+                symbolName = wxString::Format( "ID: %s", sym.ID);
+
+            wxLogError( wxString::Format(
+                    _( "Symbol '%s' is scaled in the original CADSTAR schematic but this is not"
+                       "supported in KiCad. The symbol was loaded with 1:1 scale and may require "
+                       "manual fixing." ),
+                    symbolName, sym.PartRef.RefID ) );
+        }
     }
 }
 

eeschema/sch_plugins/cadstar/cadstar_sch_archive_parser.cpp

@@ -677,6 +677,11 @@ void CADSTAR_SCH_ARCHIVE_PARSER::SYMBOL::Parse( XNODE* aNode )
         {
             Fixed = true;
         }
+        else if( cNodeName == wxT( "SCALE" ) )
+        {
+            ScaleRatioNumerator   = GetXmlAttributeIDLong( cNode, 0 );
+            ScaleRatioDenominator = GetXmlAttributeIDLong( cNode, 1 );
+        }
         else if( cNodeName == wxT( "READABILITY" ) )
         {
             Readability = ParseReadability( cNode );

eeschema/sch_plugins/cadstar/cadstar_sch_archive_parser.h

@@ -260,6 +260,8 @@ public:
         long          OrientAngle = 0;
         bool          Mirror      = false;
         bool          Fixed       = false;
+        long          ScaleRatioNumerator = 1; ///< Symbols can be arbitrarily scaled in CADSTAR
+        long          ScaleRatioDenominator = 1;
         READABILITY   Readability = READABILITY::BOTTOM_TO_TOP;
 
         bool    IsComponent = false;