Command to open chatbox in a new window (#33548)

* Command to open chatbox in a new window

* Add command for users with AdminChat permission

* Add command button to admin tools window

Content.Client/UserInterface/Systems/Chat/ChatWindow.xaml.cs

@@ -0,0 +1,44 @@
+using Content.Client.UserInterface.Controls;
+using Content.Shared.Chat;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.XAML;
+
+namespace Content.Client.UserInterface.Systems.Chat;
+
+/// <summary>
+/// Window which only holds a single chatbox, useful for monitoring multiple chats simultaneously.
+/// </summary>
+[GenerateTypedNameReferences]
+public sealed partial class ChatWindow : FancyWindow
+{
+    public ChatWindow()
+    {
+        RobustXamlLoader.Load(this);
+        IoCManager.InjectDependencies(this);
+
+        // These are necessary for the controls inside the chatbox to initialize correctly:
+        Chatbox.Repopulate();
+        var controller = UserInterfaceManager.GetUIController<ChatUIController>();
+        controller.UpdateSelectedChannel(Chatbox);
+    }
+
+    /// <summary>
+    /// Helper method to configure this window to be useful for admins.
+    /// Sets incoming filters to only admin chats and output to admin channel
+    /// </summary>
+    public void ConfigureForAdminChat()
+    {
+        Chatbox.ChatInput.ChannelSelector.Select(ChatSelectChannel.Admin);
+
+        var filter = Chatbox.ChatInput.FilterButton.Popup;
+        foreach (var c in Enum.GetValues(typeof(ChatChannel)))
+        {
+            var channel = (ChatChannel)c;
+            var isAdminInterest = channel == ChatChannel.Admin
+                                  || channel == ChatChannel.AdminChat
+                                  || channel == ChatChannel.AdminAlert
+                                  || channel == ChatChannel.AdminRelated;
+            filter.SetActive(channel, isAdminInterest);
+        }
+    }
+}