Add unit & body style property access.

(It had gotten lost in SCH_ITEM/LIB_ITEM collapse, but
then again the old version didn't work right
anyway.)

Fixes https://gitlab.com/kicad/code/kicad/-/issues/18049

eeschema/sch_symbol.cpp

@@ -422,9 +422,10 @@ void SCH_SYMBOL::UpdatePins()
 
 void SCH_SYMBOL::SetBodyStyle( int aBodyStyle )
 {
-    if( m_bodyStyle != aBodyStyle )
+    if( HasAlternateBodyStyle() && m_bodyStyle != aBodyStyle )
     {
-        m_bodyStyle = aBodyStyle;
+        m_bodyStyle = ( m_bodyStyle == BODY_STYLE::BASE ) ? BODY_STYLE::DEMORGAN
+                                                          : BODY_STYLE::BASE;
 
         // The body style may have a different pin layout so the update the pin map.
         UpdatePins();
@@ -2800,6 +2801,32 @@ static struct SCH_SYMBOL_DESC
                     NO_SETTER( SCH_SYMBOL, wxString ), &SCH_SYMBOL::GetKeyWords ),
                     groupFields );
 
+        auto multiUnit =
+                [=]( INSPECTABLE* aItem ) -> bool
+                {
+                    if( SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( aItem ) )
+                        return symbol->IsMulti();
+
+                    return false;
+                };
+
+        auto multiBodyStyle =
+                [=]( INSPECTABLE* aItem ) -> bool
+                {
+                    if( SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( aItem ) )
+                        return symbol->HasAlternateBodyStyle();
+
+                    return false;
+                };
+
+        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, int>( _HKI( "Unit" ),
+                    &SCH_SYMBOL::SetUnitProp, &SCH_SYMBOL::GetUnitProp ) )
+                .SetAvailableFunc( multiUnit );
+
+        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, int>( _HKI( "Body Style" ),
+                    &SCH_SYMBOL::SetBodyStyleProp, &SCH_SYMBOL::GetBodyStyleProp ) )
+                .SetAvailableFunc( multiBodyStyle );
+
         const wxString groupAttributes = _HKI( "Attributes" );
 
         propMgr.AddProperty( new PROPERTY<SYMBOL, bool>( _HKI( "Exclude From Board" ),

eeschema/sch_symbol.h

@@ -548,6 +548,29 @@ public:
     {
         SetValueFieldText( aRef );
     }
+    int GetUnitProp() const
+    {
+        return GetUnitSelection( &Schematic()->CurrentSheet() );
+    }
+    void SetUnitProp( int aUnit )
+    {
+        if( aUnit < 1 )
+            return;
+
+        if( aUnit > GetUnitCount() )
+            aUnit = GetUnitCount();
+
+        SetUnitSelection( &Schematic()->CurrentSheet(), aUnit );
+        SetUnit( aUnit );
+    }
+    int GetBodyStyleProp() const
+    {
+        return GetBodyStyle();
+    }
+    void SetBodyStyleProp( int aBodyStyle )
+    {
+        SetBodyStyle( aBodyStyle );
+    }
 
     /**
      * Restore fields to the original library values.