CmdPal: Update CommunityToolkit.WinUI to 8.2.251219 and remove SearchBar debouncer hacks (#46027)

## Summary of the Pull Request

Updates all `CommunityToolkit.WinUI` packages from `8.2.250402` to
`8.2.251219` (latest stable) and removes three workaround hacks from
`SearchBar.xaml.cs` that were added to paper over bugs in the
`CommunityToolkit.WinUI.Extensions` debouncer (`Debounce` with
`immediate: true` not firing correctly). Those bugs were fixed upstream
and are included in `8.2.251219`.

## PR Checklist

- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

## Detailed Description of the Pull Request / Additional comments

### Package update (`Directory.Packages.props`)

All `CommunityToolkit.WinUI` packages bumped from `8.2.250402` →
`8.2.251219`:

- `CommunityToolkit.WinUI.Animations`
- `CommunityToolkit.WinUI.Collections`
- `CommunityToolkit.WinUI.Controls.Primitives`
- `CommunityToolkit.WinUI.Controls.SettingsControls`
- `CommunityToolkit.WinUI.Controls.Segmented`
- `CommunityToolkit.WinUI.Controls.Sizers`
- `CommunityToolkit.WinUI.Converters`
- `CommunityToolkit.WinUI.Extensions`

### Hack removals (`SearchBar.xaml.cs`)

All three hacks were in `SearchBar.xaml.cs` (`Controls/`), tagged `TODO
GH #245`:

- **`FilterBox_TextChanged` — "TERRIBLE HACK"**: Forced
`DoFilterBoxUpdate()` immediately for any single-character input, then
returned early—bypassing the debouncer entirely. Now the debouncer's
`immediate: FilterBox.Text.Length <= 1` path handles this correctly.

- **Escape key handler**: After `FilterBox.Text = string.Empty`,
manually pushed the empty string to
`CurrentPageViewModel.SearchTextBox`. The `TextChanged` event fires
after the assignment and the debouncer (with `immediate: true` for
length 0) now handles propagation.

- **Backspace key handler (`else if (e.Key == VirtualKey.Back)`
block)**: Pre-emptively set `CurrentPageViewModel.SearchTextBox` to the
*pre-deletion* text in `FilterBox_KeyDown`. Entire block removed;
`TextChanged` + debouncer handle the post-deletion update correctly.

## Validation Steps Performed

Manually verified in CmdPal that:
- Typing aliases (single-character triggers) still activates filtering
immediately
- Pressing Escape clears the search box and resets the filter
- Pressing Backspace correctly updates search results after each
deletion

<!-- START COPILOT ORIGINAL PROMPT -->



<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>Update to the latest `CommunityToolkit.WinUI.Extensions`
and remove hacks</issue_title>
> <issue_description>_originally filed by @zadjii-msft_
> 
> See
https://github.com/zadjii-msft/PowerToys/pull/236#discussion_r1887714771
> 
> I had to stick a couple of HACKs into `SearchBar.xaml.cs` to work
around bugs in the toolkit debouncer. Those bugs have since been fixed
upstream, hooray! We just need a new version of the package shipped and
we can get rid of them.
> 
> ref https://github.com/zadjii-msft/PowerToys/issues/236
> 
> ----
> 
> Also!
> 
> Revert 
> 
> ```
> // TODO(stefan): REVERT THIS TO DASHBOARD PAGE!!!! SPELCHHHHEEK FAIL
> ```
> 
> from
https://github.com/zadjii-msft/PowerToys/issues/215</issue_description>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> <comment_new><author>@niels9001</author><body>
> @zadjii-msft @michaeljolley I assume we are on a later version now? Do
we still need to remove the hacks?</body></comment_new>
> <comment_new><author>@zadjii-msft</author><body>
> We sure do!
> 
> There's the SearchBar.xaml.cs ones, and I also had to manually copy
over the `TypedEventHandlerExtensions.cs`</body></comment_new>
> </comments>
> 


</details>



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- Fixes microsoft/PowerToys#38285

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: niels9001 <9866362+niels9001@users.noreply.github.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>

Directory.Packages.props

@@ -18,15 +18,15 @@
     <PackageVersion Include="SixLabors.ImageSharp" Version="2.1.12" />
     <PackageVersion Include="CommunityToolkit.Common" Version="8.4.0" />
     <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.4.0" />
-    <PackageVersion Include="CommunityToolkit.WinUI.Animations" Version="8.2.250402" />
-    <PackageVersion Include="CommunityToolkit.WinUI.Collections" Version="8.2.250402" />
-    <PackageVersion Include="CommunityToolkit.WinUI.Controls.Primitives" Version="8.2.250402" />
-    <PackageVersion Include="CommunityToolkit.WinUI.Controls.SettingsControls" Version="8.2.250402" />
-    <PackageVersion Include="CommunityToolkit.WinUI.Controls.Segmented" Version="8.2.250402" />
-    <PackageVersion Include="CommunityToolkit.WinUI.Controls.Sizers" Version="8.2.250402" />
-    <PackageVersion Include="CommunityToolkit.WinUI.Converters" Version="8.2.250402" />
-    <PackageVersion Include="CommunityToolkit.WinUI.Extensions" Version="8.2.250402" />
-    <PackageVersion Include="CommunityToolkit.WinUI.UI.Controls.DataGrid" Version="7.1.2" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Animations" Version="8.2.251219" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Collections" Version="8.2.251219" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Controls.Primitives" Version="8.2.251219" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Controls.SettingsControls" Version="8.2.251219" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Controls.Segmented" Version="8.2.251219" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Controls.Sizers" Version="8.2.251219" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Converters" Version="8.2.251219" />
+    <PackageVersion Include="CommunityToolkit.WinUI.Extensions" Version="8.2.251219" />
+    <PackageVersion Include="CommunityToolkit.WinUI.UI.Controls.DataGrid" Version="7.1.2" /> 
     <PackageVersion Include="CommunityToolkit.Labs.WinUI.Controls.MarkdownTextBlock" Version="0.1.260116-build.2514" />
     <PackageVersion Include="ControlzEx" Version="6.0.0" />
     <PackageVersion Include="HelixToolkit" Version="2.24.0" />

src/modules/cmdpal/Microsoft.CmdPal.UI/Controls/SearchBar.xaml.cs

@@ -157,12 +157,6 @@ public sealed partial class SearchBar : UserControl,
                     {
                         // Clear the search box
                         FilterBox.Text = string.Empty;
-
-                        // hack TODO GH #245
-                        if (CurrentPageViewModel is not null)
-                        {
-                            CurrentPageViewModel.SearchTextBox = FilterBox.Text;
-                        }
                     }
 
                     break;
@@ -170,14 +164,6 @@ public sealed partial class SearchBar : UserControl,
 
             e.Handled = true;
         }
-        else if (e.Key == VirtualKey.Back)
-        {
-            // hack TODO GH #245
-            if (CurrentPageViewModel is not null)
-            {
-                CurrentPageViewModel.SearchTextBox = FilterBox.Text;
-            }
-        }
     }
 
     private void FilterBox_PreviewKeyDown(object sender, KeyRoutedEventArgs e)
@@ -332,19 +318,6 @@ public sealed partial class SearchBar : UserControl,
     private void FilterBox_TextChanged(object sender, TextChangedEventArgs e)
     {
         // Logger.LogInfo($"FilterBox_TextChanged: {FilterBox.Text}");
-
-        // TERRIBLE HACK TODO GH #245
-        // There's weird wacky bugs with debounce currently. We're trying
-        // to get them ingested, but while we wait for the toolkit feeds to
-        // bubble, just manually send the first character, always
-        // (otherwise aliases just stop working)
-        if (FilterBox.Text.Length == 1)
-        {
-            DoFilterBoxUpdate();
-
-            return;
-        }
-
         if (InSuggestion)
         {
             // Logger.LogInfo($"-- skipping, in suggestion --");