Fix WinuiEx crash issue (#45443)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request
Fixes a crash related to `IsShownInSwitchers` when explorer.exe is not
running. The property has been removed from XAML and is now set in the
C# backend with added exception handling to improve stability. No
changes were made for projects where the property is set to true, as
they are not affected.

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## PR Checklist

- [ ] Closes: #xxx
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- [x] **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
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---------

Co-authored-by: vanzue <vanzue@outlook.com>

src/modules/MeasureTool/MeasureToolUI/MeasureToolXAML/MainWindow.xaml

@@ -10,7 +10,6 @@
     IsMaximizable="False"
     IsMinimizable="False"
     IsResizable="False"
-    IsShownInSwitchers="False"
     IsTitleBarVisible="False"
     mc:Ignorable="d">
     <winuiex:WindowEx.Backdrop>

src/modules/MeasureTool/MeasureToolUI/MeasureToolXAML/MainWindow.xaml.cs

@@ -52,12 +52,23 @@ namespace MeasureToolUI
             var presenter = _appWindow.Presenter as OverlappedPresenter;
             presenter.IsAlwaysOnTop = true;
             this.SetIsAlwaysOnTop(true);
-            this.SetIsShownInSwitchers(false);
             this.SetIsResizable(false);
             this.SetIsMinimizable(false);
             this.SetIsMaximizable(false);
             IsTitleBarVisible = false;
 
+            try
+            {
+                this.SetIsShownInSwitchers(false);
+            }
+            catch (NotImplementedException)
+            {
+                // WinUI will throw if explorer is not running, safely ignore
+            }
+            catch (Exception)
+            {
+            }
+
             // Remove the caption style from the window style. Windows App SDK 1.6 added it, which made the title bar and borders appear for Measure Tool. This code removes it.
             var windowStyle = GetWindowLong(hwnd, GWL_STYLE);
             windowStyle = windowStyle & (~WS_CAPTION);

src/settings-ui/QuickAccess.UI/QuickAccessXAML/MainWindow.xaml

@@ -15,7 +15,6 @@
     IsMaximizable="False"
     IsMinimizable="False"
     IsResizable="False"
-    IsShownInSwitchers="False"
     IsTitleBarVisible="False"
     mc:Ignorable="d">
     <winuiEx:WindowEx.Backdrop>

src/settings-ui/QuickAccess.UI/QuickAccessXAML/MainWindow.xaml.cs

@@ -305,7 +305,17 @@ public sealed partial class MainWindow : WindowEx, IDisposable
             return;
         }
 
-        _appWindow.IsShownInSwitchers = false;
+        try
+        {
+            _appWindow.IsShownInSwitchers = false;
+        }
+        catch (NotImplementedException)
+        {
+            // WinUI Will throw if explorer is not running, safely ignore
+        }
+        catch (Exception)
+        {
+        }
     }
 
     private bool CloakWindow()