Merge pull request #9681 from jcouv/fix-8625

Fix for #8625: SyntaxNode.Contains can use FullSpan.Contains

src/Compilers/Core/Portable/Syntax/SyntaxNode.cs

@@ -421,7 +421,7 @@ public bool ContainsDiagnostics
         /// </summary>
         public bool Contains(SyntaxNode node)
         {
-            if (node == null || !this.FullSpan.IntersectsWith(node.FullSpan))
+            if (node == null || !this.FullSpan.Contains(node.FullSpan))
             {
                 return false;
             }