CSS header contribution overlap

[Sebastien]

Hi devs,

There is an overlap of css header contribution in the following case:

A parent panel have a CSS HC, a child panel also have a CSS HC. If the
original page does not includes any of those child panel (it is completely
newly added via an ajax request), then the child CSS HC is not taken into
account. I guess it is because both CSS HC share the same id...

<style type="text/css" id="com-mycompany-panel-RedBox-0">
    .box {
        width: 150px;
        border: 2px solid black;
    }
</style>
<style type="text/css" id="com-mycompany-panel-RedBox-0">
    .red {
        background-color: red;
    }
</style>

It *might* be due to WICKET-5617 (I just had performed a quick lookup based
on issue titles), but I didn't saw any other discussion/issue about this.

Does anybody heard about this? If not, I will open an issue...

Thanks & best regards,
Sebastien.