kit/src/main/java/com/oracle/javafx/scenebuilder/kit/editor/drag/source/LibraryDragSource.java [135:150]:
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    public double getHitX() {
        final double result;
        
        final FXOMObject hitObject = getHitObject();
        if (hitObject == null) {
            result = Double.NaN;
        } else if (hitObject.isNode()) {
            final Node hitNode = (Node) hitObject.getSceneGraphObject();
            final Bounds b = hitNode.getLayoutBounds();
            result = (b.getMinX() + b.getMaxX()) / 2.0;
        } else {
            result = 0.0;
        }
        
        return result;
    }
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kit/src/main/java/com/oracle/javafx/scenebuilder/kit/editor/drag/source/ExternalDragSource.java [191:206]:
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    public double getHitX() {
        final double result;
        
        final FXOMObject hitObject = getHitObject();
        if (hitObject == null) {
            result = Double.NaN;
        } else if (hitObject.isNode()) {
            final Node hitNode = (Node) hitObject.getSceneGraphObject();
            final Bounds b = hitNode.getLayoutBounds();
            result = (b.getMinX() + b.getMaxX()) / 2.0;
        } else {
            result = 0.0;
        }
        
        return result;
    }
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