From 0e8d2500273c60ef66e6f0e954e479efd053fab5 Mon Sep 17 00:00:00 2001
From: Jonathan Pobst <jonathan.pobst@microsoft.com>
Date: Thu, 21 Oct 2021 14:39:01 -0500
Subject: [PATCH] [generator] Fix for fixing invalid annotation XML.

---
 .../AndroidAnnotationsSupport.cs                   | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/Xamarin.Android.Tools.AnnotationSupport/AndroidAnnotationsSupport.cs b/src/Xamarin.Android.Tools.AnnotationSupport/AndroidAnnotationsSupport.cs
index ef6414667..05641e280 100644
--- a/src/Xamarin.Android.Tools.AnnotationSupport/AndroidAnnotationsSupport.cs
+++ b/src/Xamarin.Android.Tools.AnnotationSupport/AndroidAnnotationsSupport.cs
@@ -70,6 +70,8 @@ static Stream FixAnnotationXML (Stream s)
 			if (doc.DocumentNode.FirstChild.InnerHtml.StartsWith ("<?xml", StringComparison.Ordinal))
 				doc.DocumentNode.FirstChild.Remove ();
 
+			FixEscapedQuotes (doc.DocumentNode);
+
 			var ms = new MemoryStream ();
 			var xs = new XmlWriterSettings {
 				Encoding = new UTF8Encoding (false),
@@ -86,6 +88,18 @@ static Stream FixAnnotationXML (Stream s)
 			return ms;
 		}
 
+		static void FixEscapedQuotes (HtmlNode node)
+		{
+			// Quotation marks in attribute values are already escaped as '&quot;', however the Save ()
+			// is interpreting them as the string '&quot;' and thinks it needs to escape the ampersand,
+			// resulting in writing '&amp;quot;'.  Here we "un-escape" the quotation mark,
+			// so that Save () will escape it correctly as '&quot;'.
+			foreach (var attr in node.Attributes)
+				attr.Value = attr.Value.Replace ("&quot;", "\"");
+
+			foreach (var child in node.ChildNodes)
+				FixEscapedQuotes (child);
+		}
 		#endregion
 
 		#region data loader