[Bug] List field "Expand All / Collapse All" buttons not rendered in "top" position when using controls: both

[olygoelements]

In forms/fields/list/list.html.twig, the collapsible variable is computed inside the {% for key, val in value %} loop (line ~90), which means it is undefined at the time the top block of collection-actions is rendered.

Result : When using controls: both in a blueprint list field, the "Expand All" and "Collapse All" buttons appear correctly at the bottom of the list, but are missing at the top.

To reproduce :

yaml
  type: list
  style: vertical
  controls: both
  collapsed: true
  btnLabel: 'Add item'
  fields:
    .field_a:
      type: text
      label: 'Field A'
    .field_b:
      type: text
      label: 'Field B'

Expected : "Expand All", "Collapse All" and "+ Add item" buttons visible both at top and bottom.
Actual : Only "+ Add item" appears at top. "Expand All" / "Collapse All" are missing at top.

Root cause :

twig
{# In list.html.twig — collapsible is set here, INSIDE the for loop #}
{% for key, val in value %}
    {% set collapsible = field.fields|length > 1 and ... %}  {# ← too late #}
But the top block is rendered before this loop :
twig{% if fieldControls in ['top', 'both'] %}
    <div class="collection-actions">
        {% if collapsible %}   {# ← undefined here, evaluates to false #}

Fix :
Move the collapsible declaration before {% block contents %} :

twig
{% set fieldControls = field.controls|default('bottom') %}

{# FIX: compute collapsible before block contents so it's available in both top AND bottom collection-actions #}
{% set collapsible = field.fields is defined and field.fields|length > 1 and (field.collapsible is not defined or field.collapsible) %}

{% block contents %}

This one-line move makes collapsible available to both the top and bottom collection-actions blocks without changing any other behavior.

Affected file :
user/plugins/form/templates/forms/fields/list/list.html.twig
(also reproduced in user/plugins/admin/themes/grav/templates/forms/fields/list/list.html.twig)
Grav version : tested on 1.7.x
Plugin form version : tested on current