Describe the bug

When using <p:selectOneRadio> with <p:ajax event="change">, the change event is unexpectedly triggered even when the user selects the already-selected radio button. This is inconsistent with standard HTML behavior, where the change event should only fire when the selection changes.

Reproducer

GitHub Reproducer:

https://github.com/tsyki/primefaces-test/tree/bug-radio-change

Minimal XHTML example:

<h:form id="frmTest">
    <p:selectOneRadio id="line" value="#{testView.radioValue}" layout="lineDirection">
        <f:selectItem itemLabel="Option1" itemValue="Option1"/>
        <f:selectItem itemLabel="Option2" itemValue="Option2"/>
        <f:selectItem itemLabel="Option3" itemValue="Option3"/>
        <p:ajax listener="#{testView.onRadioChange}" update="@form"/>
    </p:selectOneRadio>
</h:form>

Expected behavior

The change event should only fire when the user selects a different radio option than the currently selected one.

PrimeFaces edition

Community

PrimeFaces version

15.0.7

Theme

saga (default in primefaces-test)

JSF implementation

Mojarra

JSF version

4.0.11

Java version

Java 17 (Eclipse Temurin, build 17.0.16+8)

Browser(s)

No response