Fix not being able to message players that weren't filtered by the ahelp menu (#13553)

Content.Client/Administration/UI/Bwoink/BwoinkControl.xaml.cs

@@ -1,10 +1,12 @@
-using System.Text;
+using System.Linq;
+using System.Text;
 using System.Threading;
 using Content.Client.Administration.Managers;
 using Content.Client.Administration.UI.CustomControls;
 using Content.Client.Administration.UI.Tabs.AdminTab;
 using Content.Client.Stylesheets;
 using Content.Client.UserInterface.Systems.Bwoink;
+using Content.Client.UserInterface.Systems.Chat.Controls;
 using Content.Shared.Administration;
 using Robust.Client.AutoGenerated;
 using Robust.Client.Console;
@@ -171,13 +173,23 @@ namespace Content.Client.Administration.UI.Bwoink
             ChannelSelector.PopulateList();
         }
 
+
         public void SelectChannel(NetUserId channel)
         {
             if (!ChannelSelector.PlayerInfo.TryFirstOrDefault(
                 i => i.SessionId == channel, out var info))
                 return;
+
+            // clear filter if we're trying to select a channel for a player that isn't currently filtered
+            // i.e. through the message verb.
+            var data = new PlayerListData(info);
+            if (!ChannelSelector.PlayerListContainer.Data.Contains(data))
+            {
+                ChannelSelector.StopFiltering();
+            }
+
             ChannelSelector.PopulateList();
-            ChannelSelector.PlayerListContainer.Select(new PlayerListData(info));
+            ChannelSelector.PlayerListContainer.Select(data);
         }
 
         private void FixButtons()

Content.Client/Administration/UI/CustomControls/PlayerListControl.xaml.cs

@@ -62,6 +62,11 @@ namespace Content.Client.Administration.UI.CustomControls
             }
         }
 
+        public void StopFiltering()
+        {
+            FilterLineEdit.Text = string.Empty;
+        }
+
         private void FilterList()
         {
             _sortedPlayerList.Clear();