onDataChange invoked too often

@lpatiny @hamed-musallam When we import the nmr-displayer and enter/leave the component with mouse then the onDataChange method is invoked each time. It is also invoked when we just resize its container.

For an application which just takes the spectra data or correlations, for example, this is not necessary and invokes callback methods within the other application.

Is there any way to invoke this callback method only if we really change the data inside?