Don't group xml comments onto a single line (#1748)

closes #1747

Author: belav

Src/CSharpier.Core/Xml/XNodePrinters/ElementChildren.cs

@@ -113,7 +113,18 @@ public static Doc PrintChild(RawNode child, PrintingContext context)
     public static Doc PrintBetweenLine(RawNode prevNode, RawNode nextNode)
     {
         return
-            (prevNode.IsTextLike() && nextNode.IsTextLike())
+            (
+                prevNode.NodeType is XmlNodeType.Text or XmlNodeType.CDATA
+                && nextNode.NodeType is XmlNodeType.Text or XmlNodeType.CDATA
+            )
+            || (
+                prevNode.NodeType is XmlNodeType.Text or XmlNodeType.CDATA
+                && nextNode.NodeType is XmlNodeType.Comment
+            )
+            || (
+                prevNode.NodeType is XmlNodeType.Comment
+                && nextNode.NodeType is XmlNodeType.Text or XmlNodeType.CDATA
+            )
             || (
                 prevNode.NodeType is XmlNodeType.Text or XmlNodeType.CDATA
                 && nextNode.NodeType is XmlNodeType.Element

Src/CSharpier.Tests/FormattingTests/TestFiles/xml/Comments.test

@@ -5,4 +5,8 @@
     CA1031; <!-- Since this is not a library project, catching general exceptions is OK -->
     IDE0005; <!-- Allow unused usings -->
   </NoWarn>
+  <element>
+    <!-- This is the first line comment-->
+    <!-- This is the second line of my comment-->
+  </element>
 </Root>