A failed attempt at #38379

This didn't work at all.
It makes using `SearchText` in the extension just plain not work.
UpdateSearchText never gets called.
It's a bunch of bad side effects for not a lot of value

src/modules/cmdpal/Exts/Microsoft.CmdPal.Ext.Calc/CalculatorCommandProvider.cs

@@ -79,7 +79,9 @@ public sealed partial class CalculatorListPage : DynamicListPage
             };
             _items.Insert(1, li);
             _items[0].Subtitle = string.Empty;
-            SearchText = lastResult;
+            ChangeSearchText(lastResult);
+
+            // SearchText = lastResult;
             this.RaiseItemsChanged(this._items.Count);
         }
     }

src/modules/cmdpal/Exts/Microsoft.CmdPal.Ext.Indexer/Pages/DirectoryExplorePage.cs

@@ -145,7 +145,7 @@ public sealed partial class DirectoryExplorePage : DynamicListPage
         _filteredContents = null;
         _path = path;
         Title = path;
-        SearchText = string.Empty;
+        ChangeSearchText(string.Empty);
         RaiseItemsChanged(-1);
     }
 }

src/modules/cmdpal/Exts/Microsoft.CmdPal.Ext.WindowWalker/Pages/WindowWalkerListPage.cs

@@ -44,7 +44,7 @@ internal sealed partial class WindowWalkerListPage : DynamicListPage, IDisposabl
         return ResultHelper.GetResultList(searchControllerResults, !string.IsNullOrEmpty(query));
     }
 
-    public override IListItem[] GetItems() => Query(SearchText).ToArray();
+    public override IListItem[] GetItems() => Query(LastSearchText).ToArray();
 
     public void Dispose()
     {

src/modules/cmdpal/Microsoft.CmdPal.UI.ViewModels/Commands/MainListPage.cs

@@ -273,7 +273,7 @@ public partial class MainListPage : DynamicListPage,
         }
     }
 
-    public void Receive(ClearSearchMessage message) => SearchText = string.Empty;
+    public void Receive(ClearSearchMessage message) => ChangeSearchText(string.Empty);
 
     public void Receive(UpdateFallbackItemsMessage message) => RaiseItemsChanged(_tlcManager.TopLevelCommands.Count);
 

src/modules/cmdpal/extensionsdk/Microsoft.CommandPalette.Extensions.Toolkit/DynamicListPage.cs

@@ -6,16 +6,42 @@ namespace Microsoft.CommandPalette.Extensions.Toolkit;
 
 public abstract class DynamicListPage : ListPage, IDynamicListPage
 {
+    protected virtual string LastSearchText { get; private set; } = string.Empty;
+
+    protected virtual string InitialSearchText { get; set; } = string.Empty;
+
+    private string? _changedTextValue;
+
     public override string SearchText
     {
-        get => base.SearchText;
+        get
+        {
+            if (_changedTextValue == null)
+            {
+                return InitialSearchText;
+            }
+            else
+            {
+                var result = _changedTextValue;
+                _changedTextValue = null;
+                return result;
+            }
+        }
+
         set
         {
-            var oldSearch = base.SearchText;
-            base.SearchText = value;
+            var oldSearch = LastSearchText;
+            LastSearchText = value;
             UpdateSearchText(oldSearch, value);
         }
     }
 
     public abstract void UpdateSearchText(string oldSearch, string newSearch);
+
+    public void ChangeSearchText(string newText)
+    {
+        _changedTextValue = newText;
+        SearchText = newText;
+        OnPropertyChanged(nameof(SearchText));
+    }
 }