Enable PDF files in preview pane (#9088)

## Summary of the Pull Request
This PR enables user to preview PDF files in the Explorer preview pane
and in Outlook. 

**What is this about:**
Windows does not support out of the box experience for previewing PDF
files in the preview pane. Users need to install third-party software
like Adobe Acrobat reader. The PdfPreviewHandler module enbales the user
to preview PDF files.

**How does someone test / validate:** 
Run the installer, open Explorer and select a PDF file, enable the
preview pane. Maybe need to remove third-party PDF software.

## Quality Checklist

- [X] **Linked issue:** #3548
- [ ] **Communication:** I've discussed this with core contributors in the issue. 
- [X] **Tests:** Added/updated and all pass
- [X] **Installer:** Added/updated and all pass
- [X] **Localization:** All end user facing strings can be localized
- [ ] **Docs:** Added/ updated
- [x] **Binaries:** Any new files are added to WXS / YML
   - [ ] No new binaries
   - [x] YML for signing
   - [x] WXS for installer

src/settings-ui/Microsoft.PowerToys.Settings.UI.Library/PowerPreviewProperties.cs

@@ -63,6 +63,23 @@ namespace Microsoft.PowerToys.Settings.UI.Library
             }
         }
 
+        private bool enablePdfPreview = true;
+
+        [JsonPropertyName("pdf-previewer-toggle-setting")]
+        [JsonConverter(typeof(BoolPropertyJsonConverter))]
+        public bool EnablePdfPreview
+        {
+            get => enablePdfPreview;
+            set
+            {
+                if (value != enablePdfPreview)
+                {
+                    LogTelemetryEvent(value);
+                    enablePdfPreview = value;
+                }
+            }
+        }
+
         public PowerPreviewProperties()
         {
         }

src/settings-ui/Microsoft.PowerToys.Settings.UI.Library/ViewModels/PowerPreviewViewModel.cs

@@ -49,10 +49,12 @@ namespace Microsoft.PowerToys.Settings.UI.Library.ViewModels
             _svgRenderIsEnabled = Settings.Properties.EnableSvgPreview;
             _svgThumbnailIsEnabled = Settings.Properties.EnableSvgThumbnail;
             _mdRenderIsEnabled = Settings.Properties.EnableMdPreview;
+            _pdfRenderIsEnabled = Settings.Properties.EnablePdfPreview;
         }
 
         private bool _svgRenderIsEnabled;
         private bool _mdRenderIsEnabled;
+        private bool _pdfRenderIsEnabled;
         private bool _svgThumbnailIsEnabled;
 
         public bool SVGRenderIsEnabled
@@ -109,6 +111,24 @@ namespace Microsoft.PowerToys.Settings.UI.Library.ViewModels
             }
         }
 
+        public bool PDFRenderIsEnabled
+        {
+            get
+            {
+                return _pdfRenderIsEnabled;
+            }
+
+            set
+            {
+                if (value != _pdfRenderIsEnabled)
+                {
+                    _pdfRenderIsEnabled = value;
+                    Settings.Properties.EnablePdfPreview = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+
         public string GetSettingsSubPath()
         {
             return _settingsConfigFileFolder + "\\" + ModuleName;

src/settings-ui/Microsoft.PowerToys.Settings.UI.UnitTests/ViewModelTests/PowerPreview.cs

@@ -57,6 +57,7 @@ namespace ViewModelTests
             // Verify that the old settings persisted
             Assert.AreEqual(originalGeneralSettings.IsElevated, viewModel.IsElevated);
             Assert.AreEqual(originalSettings.Properties.EnableMdPreview, viewModel.MDRenderIsEnabled);
+            Assert.AreEqual(originalSettings.Properties.EnablePdfPreview, viewModel.PDFRenderIsEnabled);
             Assert.AreEqual(originalSettings.Properties.EnableSvgPreview, viewModel.SVGRenderIsEnabled);
             Assert.AreEqual(originalSettings.Properties.EnableSvgThumbnail, viewModel.SVGThumbnailIsEnabled);
 
@@ -118,5 +119,23 @@ namespace ViewModelTests
             // act
             viewModel.MDRenderIsEnabled = true;
         }
+
+        [TestMethod]
+        public void PDFRenderIsEnabledShouldPrevHandlerWhenSuccessful()
+        {
+            // Assert
+            Func<string, int> sendMockIPCConfigMSG = msg =>
+            {
+                SndModuleSettings<SndPowerPreviewSettings> snd = JsonSerializer.Deserialize<SndModuleSettings<SndPowerPreviewSettings>>(msg);
+                Assert.IsTrue(snd.PowertoysSetting.FileExplorerPreviewSettings.Properties.EnablePdfPreview);
+                return 0;
+            };
+
+            // arrange
+            PowerPreviewViewModel viewModel = new PowerPreviewViewModel(SettingsRepository<PowerPreviewSettings>.GetInstance(mockPowerPreviewSettingsUtils.Object), SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), sendMockIPCConfigMSG, PowerPreviewSettings.ModuleName);
+
+            // act
+            viewModel.PDFRenderIsEnabled = true;
+        }
     }
 }

src/settings-ui/Microsoft.PowerToys.Settings.UI/Controls/Setting/Setting.xaml

@@ -58,7 +58,6 @@
                           Foreground="{ThemeResource CardPrimaryForegroundBrush}"
                           VerticalAlignment="Center"/>
 
-
                         <StackPanel
                             VerticalAlignment="Center"
                             Grid.Column="1"

src/settings-ui/Microsoft.PowerToys.Settings.UI/Strings/en-us/Resources.resw

@@ -581,6 +581,10 @@
     <value>Enable SVG (.svg) preview</value>
     <comment>Do you want this feature on / off</comment>
   </data>
+  <data name="FileExplorerPreview_ToggleSwitch_Preview_PDF.Header" xml:space="preserve">
+    <value>Enable PDF (.pdf) preview</value>
+    <comment>Do you want this feature on / off</comment>
+  </data>
   <data name="FileExplorerPreview_ToggleSwitch_SVG_Thumbnail.Header" xml:space="preserve">
     <value>Enable SVG (.svg) thumbnails</value>
     <comment>Do you want this feature on / off</comment>

src/settings-ui/Microsoft.PowerToys.Settings.UI/Views/PowerPreviewPage.xaml

@@ -18,7 +18,6 @@
                                   ModuleImageSource="ms-appx:///Assets/Modules/PowerPreview.png">
         <controls:SettingsPageControl.ModuleContent>
             
-            
             <StackPanel Orientation="Vertical">
 
                 <muxc:InfoBar Severity="Warning"
@@ -47,10 +46,16 @@
                                           IsEnabled="{Binding Mode=OneWay, Path=IsElevated}"/>
                         </controls:Setting.ActionContent>
                     </controls:Setting>
+
+                    <controls:Setting x:Uid="FileExplorerPreview_ToggleSwitch_Preview_PDF" Icon="&#xEA90;">
+                        <controls:Setting.ActionContent>
+                            <ToggleSwitch IsOn="{x:Bind Mode=TwoWay, Path=ViewModel.PDFRenderIsEnabled}"
+                                          IsEnabled="{Binding Mode=OneWay, Path=IsElevated}"/>
+                        </controls:Setting.ActionContent>
+                    </controls:Setting>
                 </controls:SettingsGroup>
 
                 <controls:SettingsGroup x:Uid="FileExplorerPreview_IconThumbnail_GroupSettings">
-
                     <muxc:InfoBar Severity="Informational"
                                    x:Uid="FileExplorerPreview_RebootRequired"
                                    IsOpen="True"
@@ -62,9 +67,8 @@
                                           IsEnabled="{Binding Mode=OneWay, Path=IsElevated}"/>
                         </controls:Setting.ActionContent>
                     </controls:Setting>
-
-
                 </controls:SettingsGroup>
+                
             </StackPanel>
         </controls:SettingsPageControl.ModuleContent>