Fix some PCB_SHAPE properties

Hide irrelevant position/start/end properties
for shape classes that don't use them.

common/eda_shape.cpp

@@ -1687,21 +1687,36 @@ static struct EDA_SHAPE_DESC
 
         PROPERTY_MANAGER& propMgr = PROPERTY_MANAGER::Instance();
         REGISTER_TYPE( EDA_SHAPE );
+
+        auto isNotPolygon =
+                []( INSPECTABLE* aItem ) -> bool
+                {
+                    // Polygons, unlike other shapes, have no meaningful start or end coordinates
+                    if( EDA_SHAPE* shape = dynamic_cast<EDA_SHAPE*>( aItem ) )
+                        return shape->GetShape() != SHAPE_T::POLY;
+
+                    return false;
+                };
+
         auto shape = new PROPERTY_ENUM<EDA_SHAPE, SHAPE_T>( _HKI( "Shape" ),
                      NO_SETTER( EDA_SHAPE, SHAPE_T ), &EDA_SHAPE::GetShape );
         propMgr.AddProperty( shape );
         propMgr.AddProperty( new PROPERTY<EDA_SHAPE, int>( _HKI( "Start X" ),
                     &EDA_SHAPE::SetStartX, &EDA_SHAPE::GetStartX, PROPERTY_DISPLAY::PT_COORD,
-                    ORIGIN_TRANSFORMS::ABS_X_COORD ) );
+                    ORIGIN_TRANSFORMS::ABS_X_COORD ) )
+                .SetAvailableFunc( isNotPolygon );
         propMgr.AddProperty( new PROPERTY<EDA_SHAPE, int>( _HKI( "Start Y" ),
                     &EDA_SHAPE::SetStartY, &EDA_SHAPE::GetStartY, PROPERTY_DISPLAY::PT_COORD,
-                    ORIGIN_TRANSFORMS::ABS_Y_COORD ) );
+                    ORIGIN_TRANSFORMS::ABS_Y_COORD ) )
+                .SetAvailableFunc( isNotPolygon );
         propMgr.AddProperty( new PROPERTY<EDA_SHAPE, int>( _HKI( "End X" ),
                     &EDA_SHAPE::SetEndX, &EDA_SHAPE::GetEndX, PROPERTY_DISPLAY::PT_COORD,
-                    ORIGIN_TRANSFORMS::ABS_X_COORD ) );
+                    ORIGIN_TRANSFORMS::ABS_X_COORD ) )
+                .SetAvailableFunc( isNotPolygon );
         propMgr.AddProperty( new PROPERTY<EDA_SHAPE, int>( _HKI( "End Y" ),
                     &EDA_SHAPE::SetEndY, &EDA_SHAPE::GetEndY, PROPERTY_DISPLAY::PT_COORD,
-                    ORIGIN_TRANSFORMS::ABS_Y_COORD ) );
+                    ORIGIN_TRANSFORMS::ABS_Y_COORD ) )
+                .SetAvailableFunc( isNotPolygon );
         // TODO: m_arcCenter, m_bezierC1, m_bezierC2, m_poly
         propMgr.AddProperty( new PROPERTY<EDA_SHAPE, int>( _HKI( "Line Width" ),
                     &EDA_SHAPE::SetWidth, &EDA_SHAPE::GetWidth, PROPERTY_DISPLAY::PT_SIZE ) );

pcbnew/pcb_shape.cpp

@@ -410,5 +410,21 @@ static struct PCB_SHAPE_DESC
                 _HKI( "Layer" ), &PCB_SHAPE::SetLayer, &PCB_SHAPE::GetLayer );
 
         propMgr.ReplaceProperty( TYPE_HASH( BOARD_ITEM ), _HKI( "Layer" ), layerProperty );
+
+        // Only polygons have meaningful Position properties.
+        // On other shapes, these are duplicates of the Start properties.
+        auto isPolygon =
+                []( INSPECTABLE* aItem ) -> bool
+                {
+                    if( PCB_SHAPE* shape = dynamic_cast<PCB_SHAPE*>( aItem ) )
+                        return shape->GetShape() == SHAPE_T::POLY;
+
+                    return false;
+                };
+
+        propMgr.OverrideAvailability( TYPE_HASH( PCB_SHAPE ), TYPE_HASH( BOARD_ITEM ),
+                                      _HKI( "Position X" ), isPolygon );
+        propMgr.OverrideAvailability( TYPE_HASH( PCB_SHAPE ), TYPE_HASH( BOARD_ITEM ),
+                                      _HKI( "Position Y" ), isPolygon );
     }
 } _PCB_SHAPE_DESC;