Fix tests and fix ControlCatalog.iOS to not reference Sprache.

samples/ControlCatalog.iOS/ControlCatalog.iOS.csproj

@@ -174,6 +174,5 @@
       <Name>ControlCatalog</Name>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="..\..\build\Sprache.props" />
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
-</Project>
+</Project>

src/Avalonia.Base/Data/Core/ExpressionParseException.cs

@@ -17,6 +17,7 @@ namespace Avalonia.Data.Core
         /// </summary>
         /// <param name="column">The column position of the error.</param>
         /// <param name="message">The exception message.</param>
+        /// <param name="innerException">The exception that caused the parsing failure.</param>
         public ExpressionParseException(int column, string message, Exception innerException = null)
             : base(message, innerException)
         {

src/Markup/Avalonia.Markup/Markup/Parsers/ExpressionParser.cs

@@ -216,11 +216,11 @@ namespace Avalonia.Markup.Parsers
         {
             var mode = r.ParseIdentifier();
 
-            if (mode == "self".AsSpan())
+            if (mode.Equals("self".AsSpan(), StringComparison.InvariantCulture))
             {
                 nodes.Add(new SelfNode());
             }
-            else if (mode == "parent".AsSpan())
+            else if (mode.Equals("parent".AsSpan(), StringComparison.InvariantCulture))
             {
                 Type ancestorType = null;
                 var ancestorLevel = 0;