Late Join Menu Properly Retains Position On New Player Joins (#26483)

* When another player late joins it will correctly update the UI locally

* Resolve passengers not displaying the correct message in late join

* Improve final boolean comparison of button disabled state to be a bit neater

Content.Client/LateJoin/LateJoinGui.cs

@@ -33,7 +33,7 @@ namespace Content.Client.LateJoin
         private readonly SpriteSystem _sprites;
         private readonly CrewManifestSystem _crewManifest;
 
-        private readonly Dictionary<NetEntity, Dictionary<string, JobButton>> _jobButtons = new();
+        private readonly Dictionary<NetEntity, Dictionary<string, List<JobButton>>> _jobButtons = new();
         private readonly Dictionary<NetEntity, Dictionary<string, BoxContainer>> _jobCategories = new();
         private readonly List<ScrollContainer> _jobLists = new();
 
@@ -163,11 +163,12 @@ namespace Content.Client.LateJoin
                 var departments = _prototypeManager.EnumeratePrototypes<DepartmentPrototype>().ToArray();
                 Array.Sort(departments, DepartmentUIComparer.Instance);
 
+                _jobButtons[id] = new Dictionary<string, List<JobButton>>();
+
                 foreach (var department in departments)
                 {
                     var departmentName = Loc.GetString($"department-{department.ID}");
                     _jobCategories[id] = new Dictionary<string, BoxContainer>();
-                    _jobButtons[id] = new Dictionary<string, JobButton>();
                     var stationAvailable = _gameTicker.JobsAvailable[id];
                     var jobsAvailable = new List<JobPrototype>();
 
@@ -223,7 +224,13 @@ namespace Content.Client.LateJoin
                     foreach (var prototype in jobsAvailable)
                     {
                         var value = stationAvailable[prototype.ID];
-                        var jobButton = new JobButton(prototype.ID, value);
+
+                        var jobLabel = new Label
+                        {
+                            Margin = new Thickness(5f, 0, 0, 0)
+                        };
+
+                        var jobButton = new JobButton(jobLabel, prototype.ID, prototype.LocalizedName, value);
 
                         var jobSelector = new BoxContainer
                         {
@@ -241,14 +248,6 @@ namespace Content.Client.LateJoin
                         icon.Texture = _sprites.Frame0(jobIcon.Icon);
                         jobSelector.AddChild(icon);
 
-                        var jobLabel = new Label
-                        {
-                            Margin = new Thickness(5f, 0, 0, 0),
-                            Text = value != null ?
-                                Loc.GetString("late-join-gui-job-slot-capped", ("jobName", prototype.LocalizedName), ("amount", value)) :
-                                Loc.GetString("late-join-gui-job-slot-uncapped", ("jobName", prototype.LocalizedName)),
-                        };
-
                         jobSelector.AddChild(jobLabel);
                         jobButton.AddChild(jobSelector);
                         category.AddChild(jobButton);
@@ -280,15 +279,43 @@ namespace Content.Client.LateJoin
                             jobButton.Disabled = true;
                         }
 
-                        _jobButtons[id][prototype.ID] = jobButton;
+                        if (!_jobButtons[id].ContainsKey(prototype.ID))
+                        {
+                            _jobButtons[id][prototype.ID] = new List<JobButton>();
+                        }
+
+                        _jobButtons[id][prototype.ID].Add(jobButton);
                     }
                 }
             }
         }
 
-        private void JobsAvailableUpdated(IReadOnlyDictionary<NetEntity, Dictionary<string, uint?>> _)
+        private void JobsAvailableUpdated(IReadOnlyDictionary<NetEntity, Dictionary<string, uint?>> updatedJobs)
         {
-            RebuildUI();
+            foreach (var stationEntries in updatedJobs)
+            {
+                if (_jobButtons.ContainsKey(stationEntries.Key))
+                {
+                    var jobsAvailable = stationEntries.Value;
+
+                    var existingJobEntries = _jobButtons[stationEntries.Key];
+                    foreach (var existingJobEntry in existingJobEntries)
+                    {
+                        if (jobsAvailable.ContainsKey(existingJobEntry.Key))
+                        {
+                            var updatedJobValue = jobsAvailable[existingJobEntry.Key];
+                            foreach (var matchingJobButton in existingJobEntry.Value)
+                            {
+                                if (matchingJobButton.Amount != updatedJobValue)
+                                {
+                                    matchingJobButton.RefreshLabel(updatedJobValue);
+                                    matchingJobButton.Disabled = matchingJobButton.Amount == 0;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
         }
 
         protected override void Dispose(bool disposing)
@@ -307,14 +334,33 @@ namespace Content.Client.LateJoin
 
     sealed class JobButton : ContainerButton
     {
+        public Label JobLabel { get; }
         public string JobId { get; }
-        public uint? Amount { get; }
+        public string JobLocalisedName { get; }
+        public uint? Amount { get; private set; }
+        private bool _initialised = false;
 
-        public JobButton(string jobId, uint? amount)
+        public JobButton(Label jobLabel, string jobId, string jobLocalisedName, uint? amount)
         {
+            JobLabel = jobLabel;
             JobId = jobId;
-            Amount = amount;
+            JobLocalisedName = jobLocalisedName;
+            RefreshLabel(amount);
             AddStyleClass(StyleClassButton);
+            _initialised = true;
+        }
+
+        public void RefreshLabel(uint? amount)
+        {
+            if (Amount == amount && _initialised)
+            {
+                return;
+            }
+            Amount = amount;
+
+            JobLabel.Text = Amount != null ?
+                Loc.GetString("late-join-gui-job-slot-capped", ("jobName", JobLocalisedName), ("amount", Amount)) :
+                Loc.GetString("late-join-gui-job-slot-uncapped", ("jobName", JobLocalisedName));
         }
     }
 }