further user name display changes

assets/javascripts/discourse/components/topic-level-assign-menu.js

@@ -72,7 +72,12 @@ export default {
     const content = [];
 
     if (this.topic.isAssigned()) {
-      content.push(unassignFromTopicButton(this.topic));
+      content.push(
+        unassignFromTopicButton(
+          this.topic,
+          this.siteSettings.prioritize_full_name_in_ux
+        )
+      );
     }
 
     if (this.topic.hasAssignedPosts()) {
@@ -131,9 +136,14 @@ function reassignToSelfButton() {
   };
 }
 
-function unassignFromTopicButton(topic) {
+function unassignFromTopicButton(topic, prioritize_full_name_in_ux) {
-  const username =
+  let username =
     topic.assigned_to_user?.username || topic.assigned_to_group?.name;
+
+  if (topic.assigned_to_user && prioritize_full_name_in_ux) {
+    username = topic.assigned_to_user?.name || topic.assigned_to_user?.username;
+  }
+
   const icon = topic.assigned_to_user
     ? avatarHtml(topic.assigned_to_user, "small")
     : iconHTML("user-xmark");

lib/assigner.rb

@@ -405,9 +405,7 @@ class ::Assigner
       if SiteSetting.unassign_creates_tracking_post && !silent
         post_type = SiteSetting.assigns_public ? Post.types[:small_action] : Post.types[:whisper]
 
-        custom_fields = {
+        custom_fields = small_action_username_or_name(assigned_to)
-          "action_code_who" => assigned_to.is_a?(User) ? assigned_to.username : assigned_to.name,
-        }
 
         if post_target?
           custom_fields.merge!("action_code_path" => "/p/#{@target.id}")
@@ -493,10 +491,19 @@ class ::Assigner
     Jobs.enqueue(:assign_notification, assignment_id: assignment.id)
   end
 
+  def small_action_username_or_name(assign_to)
+    if assign_to.is_a?(User) && SiteSetting.prioritize_full_name_in_ux && !assign_to.username
+      custom_fields = { "action_code_who" => assign_to.name || assign_to.username }
+    else
+      custom_fields = {
+        "action_code_who" => assign_to.is_a?(User) ? assign_to.username : assign_to.name,
+      }
+    end
+    custom_fields
+  end
+
   def add_small_action_post(action_code, assign_to, text)
-    custom_fields = {
+    custom_fields = small_action_username_or_name(assign_to)
-      "action_code_who" => assign_to.is_a?(User) ? assign_to.username : assign_to.name,
-    }
 
     if post_target?
       custom_fields.merge!(