Column Filter Watermark is Not Showing in PrimeFaces in 6.0.19 Onwards

问题

Since PrimeFaces 6.0.19 onwards including 6.0.20 and 6.1.x(6.1.1 and 6.1.2) our code for column filter watermark is not working as below:

<h:form id="myForm">
  <p:dataTable id="myTable">
    <p:column id="column2" filterBy="column2">
      <f:facet name="header">
      <p:watermark for="@(#myForm\\:myTable\\:column2\\:filter)"
      value="Watermark 2" />
      <h:outputText value="Column2" />
      </f:facet>
    </p:column>
</p:dataTable>
</h:form>

Before the version 6.0.19, our code is working well. I hope you can give us some tips on this on how to handle or display column filter watermark. JSF:2.2 Payara Server(Glassfish Fork): 4.1.1.171 and 4.1.2.172 Primefaces: 6.0.19 including 6.0.20 and 6.1.x(6.1.1 and 6.1.2)

来源：https://stackoverflow.com/questions/44427332/column-filter-watermark-is-not-showing-in-primefaces-in-6-0-19-onwards