Over at Flag module, we need to add the flag links to node and comment links.
Because the link is different for each user, and changes if the flag status changes, it can't be cached with the node, or the node links, and instead needs to be built with a lazy builder.
We've got this working with the link that appears a pseudofield, because that gets its own render array. But hook_node_links_alter() gives us a $links array which is passed to theme_links(), so it doesn't seem that it's possible to do this at the moment.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I've got this working!
You do:
$placeholder = Crypt::hashBase64(something unique);
$links['mythings'] = [
'#theme' => 'links__node__mystuff',
'#links' => [
'mykey' => [
'title' => $placeholder,
]
],
];
$links['#attached']['placeholders'][$placeholder] = [
'#lazy_builder' => [
// The lazy builder callback and parameters.
'lazybuildercallback',
[
// lazy builder params
],
],
];