Completion for enum for #switch section

[angelozerr]

See https://quarkus.io/guides/qute-reference#when_section

Given this template where machine.status is an anum with ON, OFF and BROKEN value:

{#when machine.status}
  {#is |} 
    It's running. 
{/when}

completion on | should show ON, OFF and BROKEN.

{#when machine.status}
  {#is ON |} 
    It's running. 
{/when}

completion on | should showOFF and BROKEN (and not ON).