Primefaces TreeTable sorting freze collapse - sorting

Question

is it possible to keep the behaviour more stable?
what I have:
an Tree table with 3 columns, first has collapsed stuff in it
if I open one and close it, then click on sort
it is open after that
what I would like to have:
keep it closed if it was closed before sort
<h:form id="form">
<p:treeTable value="#{ttBasicView.root}" var="document">
<f:facet name="header">
FritzBox Smart Home Daten
</f:facet>
<p:column headerText="Name" >
<h:outputText value="#{document.name}" />
</p:column>
<p:column headerText="Gesamtverbrauch (in kWh)" sortBy="#{document.gesamtverbrauch}" actionListener="#{BasicView.expandAll}">
<h:outputText value="#{document.gesamtverbrauch}" />
</p:column>
<p:column headerText="aktuelle Temperatur" sortBy="#{document.akttemperatur}">
<h:outputText value="#{document.akttemperatur}" />
</p:column>
<p:column style="width:24px">
<p:commandLink update=":form:documentPanel" oncomplete="PF('documentDialog').show()" title="View Detail" styleClass="ui-icon ui-icon-search">
<f:setPropertyActionListener value="#{document}" target="#{ttBasicView.selectedDocument}" />
</p:commandLink>
</p:column>
</p:treeTable>
<p:dialog id="dialog" header="Document Detail" showEffect="fade" widgetVar="documentDialog" modal="true" resizable="false">
<p:outputPanel id="documentPanel">
<p:panelGrid columns="2" columnClasses="label,value" rendered="#{not empty ttBasicView.selectedDocument}">
<h:outputLabel for="name" value="Name: " />
<h:outputText id="name" value="#{ttBasicView.selectedDocument.name}" style="font-weight:bold" />
<h:outputLabel for="gesamtverbrauch" value="Gesamtverbrauch: " />
<h:outputText id="gesamtverbrauch" value="#{ttBasicView.selectedDocument.gesamtverbrauch}" style="font-weight:bold" />
<h:outputLabel for="akttemperatur" value="aktuelle Temperatur: " />
<h:outputText id="akttemperatur" value="#{ttBasicView.selectedDocument.akttemperatur}" style="font-weight:bold" />
</p:panelGrid>
</p:outputPanel>
</p:dialog>
</h:form>

Answer 1

That was my problem too.
Try it in your treeTable :
<p:ajax event="collapse"
onstart="handleLoadingStarted()"
oncomplete="handleLoadingStopped()" />