Drop whitespace-only text nodes between block elements

md2loop.Core/HtmlToMarkdownConverter.cs

@@ -44,6 +44,15 @@ private static void ConvertNode(HtmlNode node, StringBuilder sb, int listDepth,
             {
                 sb.Append(text);
             }
+            else if (text.AsSpan().IsWhiteSpace())
+            {
+                // Whitespace between block elements is layout, not content. A block
+                // ends with a newline, so a whitespace-only node there would become
+                // a stray leading space on the next block. Between inline elements
+                // the same node is a real word separator and has to be kept.
+                if (sb.Length > 0 && sb[^1] != '\n')
+                    sb.Append(' ');
+            }
             else
             {
                 sb.Append(EscapeInline(CollapseWhitespaceRegex().Replace(text, " ")));

tests/md2loop.Tests/RoundTripTests.cs

@@ -97,7 +97,7 @@ public void ParagraphAfterAList_StaysASeparateBlock()
         Assert.Equal("- one\n- two\n\nAfter the list.", RoundTrip("- one\n- two\n\nAfter the list."));
     }
 
-    [Fact(Skip = "Known bug #33: whitespace between block elements leaks a leading space into the next block.")]
+    [Fact]
     public void WhitespaceBetweenBlocks_DoesNotIndentTheNextBlock()
     {
         Assert.Equal("one\n\ntwo", HtmlToMarkdownConverter.Convert("<p>one</p>\n<p>two</p>").Replace("\r\n", "\n"));