Simplify constructors of Ancillary helpers

source/MRViewer/MRAncillaryLabels.h

@@ -22,7 +22,7 @@ struct MRVIEWER_CLASS AncillaryLabel
     AncillaryLabel() = default;
 
     /// since this uniquely owns an ancillary object, we provide only move operations, not copy
-    AncillaryLabel( AncillaryLabel && b ) noexcept : obj{ std::move( b.obj ) } {}
+    AncillaryLabel( AncillaryLabel && b ) noexcept = default;
     AncillaryLabel & operator =( AncillaryLabel && b ) { reset(); obj = std::move( b.obj ); return *this; }
 
     /// Make not-pickable ancillary object, link it to parent object, and set label text

source/MRViewer/MRAncillaryLines.h

@@ -16,9 +16,8 @@ struct MRVIEWER_CLASS AncillaryLines
     AncillaryLines() = default;
 
     /// since this uniquely owns an ancillary object, we provide only move operations, not copy
-    AncillaryLines( AncillaryLines && b ) noexcept : obj{ std::move( b.obj ) } {}
+    AncillaryLines( AncillaryLines && b ) noexcept = default;
     AncillaryLines & operator =( AncillaryLines && b ) { reset(); obj = std::move( b.obj ); return *this; }
-    AncillaryLines( AncillaryLines& b ) = default;
 
     /// Make not-pickable ancillary object, link it to parent object, and set line geometry
     explicit AncillaryLines( Object& parent, const Contours3f& contours = {} ) { make( parent, contours ); }

source/MRViewer/MRAncillaryMesh.h

@@ -15,7 +15,7 @@ struct MRVIEWER_CLASS AncillaryMesh
     AncillaryMesh() = default;
 
     /// since this uniquely owns an ancillary object, we provide only move operations, not copy
-    AncillaryMesh( AncillaryMesh && b ) noexcept : obj{ std::move( b.obj ) } {}
+    AncillaryMesh( AncillaryMesh && b ) noexcept = default;
     AncillaryMesh & operator =( AncillaryMesh && b ) { reset(); obj = std::move( b.obj ); return *this; }
 
     /// Make not-pickable object, link it to parent object

source/MRViewer/MRAncillaryPoints.h

@@ -15,7 +15,7 @@ struct MRVIEWER_CLASS AncillaryPoints
     AncillaryPoints() = default;
 
     /// since this uniquely owns an ancillary object, we provide only move operations, not copy
-    AncillaryPoints( AncillaryPoints && b ) noexcept : obj{ std::move( b.obj ) } {}
+    AncillaryPoints( AncillaryPoints && b ) noexcept = default;
     AncillaryPoints & operator =( AncillaryPoints && b ) { reset(); obj = std::move( b.obj ); return *this; }
 
     /// Make not-pickable object, link it to parent object