Qute: user-defined tags should allow insert's like include does

[Mai-Lapyst]

Description

Tags are currently documented as "can be used to include a template and optionally pass some parameters" (https://quarkus.io/guides/qute-reference#user_tags).

But inside a (user-defined) tag, you cannot use insert to embed nested sections/tags, to for example allow the following:

{#mylist name="My List"}
  {#header}<p>Some more informations</p>{/header}
  {#footer}<button>Add Element</button>{/footer}
{/mylist}

{! mylist tag !}
<div>
  <h1>{name}</h1>
  {#insert header}
  <ul>...</ul>
  {#insert footer}
</div>

I know that there is {nested-content}, but this only allows for the complete body to be used, not single tags from it like insert does when include-ing.

Implementation ideas

No response

[quarkus-bot]

/cc @mkouba

[mkouba]

Well, tags were not meant to be used for template inheritance but we can definitely consider adding this functionality.