Disallow multiple entries for the same role

app/views/console/comps/permissions-matrix.phtml

@@ -91,7 +91,7 @@ $escapedPermissions = \array_map(function ($perm) {
 
                 <input
                     required
-                    id="<?php echo $form; ?>"
+                    id="<?php echo $form; ?>Input"
                     name="<?php echo $form; ?>"
                     form="<?php echo $form ?>"
                     list="types"

public/scripts/permissions-matrix.js

@@ -34,6 +34,10 @@
                 });
             },
             addPermission(formId, role, permissions) {
+                if (this.permissions.some(p => p.role === role)) {
+                    document.getElementById(`${formId}Input`)
+                        .setCustomValidity('Role entry already exists');
+                }
                 if (!document.getElementById(formId).reportValidity()) {
                     return;
                 }