Add DisableHtml property to MarkdownTextBlock

Calls DisableHtml method on Markdig pipeline, as well as not adding any Html based renderer, HtmlBlockRenderer, HtmlEntityInlineRenderer, and HtmlInlineRenderer.
When enabled, results in any html tags being ignored and plain-text parts remaining, unformatted.

Committing Patch on behalf of Ameya Kulkarni

Author: michael-hawker

components/MarkdownTextBlock/src/MarkdownTextBlock.Properties.cs

@@ -70,7 +70,16 @@ public partial class MarkdownTextBlock
         nameof(UseAutoLinks),
         typeof(bool),
         typeof(MarkdownTextBlock),
-        new PropertyMetadata(false));
+        new PropertyMetadata(false));
+
+    /// <summary>
+    /// Identifies the <see cref="DisableHtmlProperty"/> dependency property.
+    /// </summary>
+    private static readonly DependencyProperty DisableHtmlProperty = DependencyProperty.Register(
+        nameof(DisableHtmlProperty),
+        typeof(bool),
+        typeof(MarkdownTextBlock),
+        new PropertyMetadata(false));
 
     /// <summary>
     /// Identifies the <see cref="UseSoftlineBreakAsHardlineBreak"/> dependency property.
@@ -148,7 +157,16 @@ public bool UseAutoLinks
     {
         get => (bool)GetValue(UseAutoLinksProperty);
         set => SetValue(UseAutoLinksProperty, value);
-    }
+    }
+
+    /// <summary>
+    /// If true, Disables HTML parsing.
+    /// </summary>
+    public bool DisableHtml
+    {
+        get => (bool)GetValue(DisableHtmlProperty);
+        set => SetValue(DisableHtmlProperty, value);
+    }
 
     /// <summary>
     /// If true, considers single newlines as hardline breaks.

components/MarkdownTextBlock/src/MarkdownTextBlock.xaml.cs

@@ -59,7 +59,8 @@ protected override void OnApplyTemplate()
         if (UseListExtras) pipelineBuilder = pipelineBuilder.UseListExtras();
         if (UseTaskLists) pipelineBuilder = pipelineBuilder.UseTaskLists();
         if (UseAutoLinks) pipelineBuilder = pipelineBuilder.UseAutoLinks();
-        if (UseSoftlineBreakAsHardlineBreak) pipelineBuilder = pipelineBuilder.UseSoftlineBreakAsHardlineBreak();
+        if (UseSoftlineBreakAsHardlineBreak) pipelineBuilder = pipelineBuilder.UseSoftlineBreakAsHardlineBreak();
+        if (DisableHtml) pipelineBuilder = pipelineBuilder.DisableHtml();
 
         _pipeline = pipelineBuilder.Build();
 
@@ -110,23 +111,23 @@ private void Build()
                 _renderer.ObjectRenderers.Add(new ParagraphRenderer());
                 _renderer.ObjectRenderers.Add(new QuoteBlockRenderer());
                 _renderer.ObjectRenderers.Add(new ThematicBreakRenderer());
-                _renderer.ObjectRenderers.Add(new HtmlBlockRenderer());
+                if (!DisableHtml) _renderer.ObjectRenderers.Add(new HtmlBlockRenderer());
 
                 // Default inline renderers
                 if (UseAutoLinks) _renderer.ObjectRenderers.Add(new AutoLinkInlineRenderer());
                 _renderer.ObjectRenderers.Add(new CodeInlineRenderer());
                 _renderer.ObjectRenderers.Add(new DelimiterInlineRenderer());
                 _renderer.ObjectRenderers.Add(new EmphasisInlineRenderer());
-                _renderer.ObjectRenderers.Add(new HtmlEntityInlineRenderer());
+                if (!DisableHtml) _renderer.ObjectRenderers.Add(new HtmlEntityInlineRenderer());
                 _renderer.ObjectRenderers.Add(new LineBreakInlineRenderer());
                 _renderer.ObjectRenderers.Add(new LinkInlineRenderer());
                 _renderer.ObjectRenderers.Add(new LiteralInlineRenderer());
                 _renderer.ObjectRenderers.Add(new ContainerInlineRenderer());
 
                 // Extension renderers
                 if (UsePipeTables) _renderer.ObjectRenderers.Add(new TableRenderer());
-                if (UseTaskLists) _renderer.ObjectRenderers.Add(new TaskListRenderer());
-                _renderer.ObjectRenderers.Add(new HtmlInlineRenderer());
+                if (UseTaskLists) _renderer.ObjectRenderers.Add(new TaskListRenderer());
+                if (!DisableHtml) _renderer.ObjectRenderers.Add(new HtmlInlineRenderer());
             }
             _pipeline.Setup(_renderer);
             ApplyText(false);