bug #5333 Make Collection fields not sortable (javiereguiluz)

This PR was merged into the 4.x branch.

Discussion
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Make Collection fields not sortable

Fixes #4342.

Commits
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f6063b7 Make Collection fields not sortable

src/Field/Configurator/CollectionConfigurator.php

@@ -55,6 +55,9 @@ public function configure(FieldDto $field, EntityDto $entityDto, AdminContext $c
             $field->setFormTypeOption('entry_options.attr.data-ea-widget', 'ea-autocomplete');
         }
 
+        // the contents of this field are a collection of other fields, so it cannot be sorted
+        $field->setSortable(false);
+
         $field->setFormTypeOptionIfNotSet('allow_add', $field->getCustomOptions()->get(CollectionField::OPTION_ALLOW_ADD));
         $field->setFormTypeOptionIfNotSet('allow_delete', $field->getCustomOptions()->get(CollectionField::OPTION_ALLOW_DELETE));
         $field->setFormTypeOptionIfNotSet('by_reference', false);