Richfaces 4 bug in datatable with datascroller validation when empty - validation

Question

I have a screen in my Richfaces application which uses a datatable and datascroller, with validation to ensure that data is filled.
( example to simulate the problem, full example can be found here
<h:form id="articleForm" >
<h:panelGroup layout="block">
<rich:messages globalOnly="true" />
<rich:dataTable value="#{productModifyBean.articles}" var="article" id="articleTable"
rows="15" >
<rich:column headerClass="headerOverflow artNrColumn">
<f:facet name="header">
<h:outputText value="articleNumber" />
</f:facet>
<h:outputText value="#{article.articleNumber}"/>
</rich:column>
<rich:column headerClass="headerOverflow shortNameColumn">
<f:facet name="header">
<h:outputText value="Name" />
</f:facet>
<h:outputText value="#{article.shortName}" />
</rich:column>
<rich:column headerClass="headerOverflow quantityColumn" >
<f:facet name="header">
<h:outputText value="Quantity" />
</f:facet>
<h:inputText value="#{article.quantity}" required="true"
requiredMessage="This is required" converterMessage="Error conversion"
id="modifyArticleFormatQuantity" >
</h:inputText>
<rich:message for="modifyArticleFormatQuantity" errorClass="errorColorRed" />
</rich:column>
</rich:dataTable>
<rich:dataScroller for="articleTable" renderIfSinglePage="false" boundaryControls="show" fastControls="hide" execute="#form" render="articleTable"
stepControls="show" style="float:right;" />
</h:panelGroup>
<br style="clear: both" />
<br style="clear: both" />
<div align="right" style="clear: both">
<a4j:commandButton value="#{msgs['button.modify'] }" styleClass="submitButton"
render="#{facesContext.validationFailed ? '#none' : 'articleForm'}"
actionListener="#{productModifyBean.modifyProduct}">
</a4j:commandButton>
</div>
</h:form>
Data validation should happen when the user presses the submit button ( to save the data) , and when the user using the pagination to go to a different page.
When clicking the submit button after leaving one field empty, the behaviour is normal : it shows an empty field with the remark 'this is required'
However, when instead moving to a different page ( for example clicking on the '2' page button ) , validation happens correctly, but the old value is put back into the screen, thus stating that the value should be filled but showing it filled in with a value.
Anyone have any idea what the reason for this problem could be, and how to resolve it ? Is this a bug in RichFaces, or am I overlooking something ?

Answer 1

I found the solution by trial and error :
If I change the datascroller to use render="#region" , the screen is correctly rendered.
<rich:dataScroller for="articleTable" renderIfSinglePage="false" boundaryControls="show" fastControls="hide" execute="#form" render="articleTable"
stepControls="show" style="float:right;" />