From bbf022404ca4a7f94e7dbf8149f1f5f1aa97a69f Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Thu, 29 Oct 2026 20:29:16 +0000
Subject: [PATCH] Leave the pending indentation alone on an empty Write [patch]

Write("") and Write(null) reached IndentedTextWriter.Write, which writes
the pending tabs and clears its tabs-pending flag even for empty text.
A following NewLine() then left the tabs on the blank line and the next
line started at column 0. Write now returns early for empty input.

Fixes #126

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017vfJW3gZxmT7yZRzkmnHAX
---
 CodeBlocker.Test/CodeBlockerTests.cs | 19 +++++++++++++++++++
 CodeBlocker/CodeBlocker.cs           | 13 ++++++++++---
 2 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/CodeBlocker.Test/CodeBlockerTests.cs b/CodeBlocker.Test/CodeBlockerTests.cs
index 40f71af..55460d7 100644
--- a/CodeBlocker.Test/CodeBlockerTests.cs
+++ b/CodeBlocker.Test/CodeBlockerTests.cs
@@ -87,6 +87,25 @@ public void NewLineAfterAPartialWriteKeepsTheNextLineIndented()
 		Assert.AreEqual("class C\n{\n\tint x = 1;\n\tint y = 2;\n}\n", codeBlocker.ToString());
 	}
 
+	[TestMethod]
+	[DataRow("")]
+	[DataRow(null)]
+	public void NewLineAfterAnEmptyWriteKeepsTheNextLineIndented(string? text)
+	{
+		using CodeBlocker codeBlocker = CodeBlocker.Create();
+
+		codeBlocker.WriteLine("class C");
+		using (new Scope(codeBlocker))
+		{
+			codeBlocker.WriteLine("int a;");
+			codeBlocker.Write(text!);
+			codeBlocker.NewLine();
+			codeBlocker.WriteLine("int b;");
+		}
+
+		Assert.AreEqual("class C\n{\n\tint a;\n\n\tint b;\n}\n", codeBlocker.ToString());
+	}
+
 	[TestMethod]
 	public void NewLineAtTheStartOfALineStillWritesNoIndentation()
 	{
diff --git a/CodeBlocker/CodeBlocker.cs b/CodeBlocker/CodeBlocker.cs
index 7c0ed6a..64f1338 100644
--- a/CodeBlocker/CodeBlocker.cs
+++ b/CodeBlocker/CodeBlocker.cs
@@ -262,13 +262,20 @@ public void WriteLine()
 	/// Write a line of code with indentation.
 	/// </summary>
 	/// <param name="text">The text to write.</param>
+	/// <remarks>
+	/// Writing an empty or null string does nothing. In particular it does not consume the
+	/// indentation pending at the start of a line, which would leave it on the blank line a
+	/// following <see cref="NewLine"/> writes and drop the line after that to column 0.
+	/// </remarks>
 	public void Write(string text)
 	{
-		IndentedTextWriter.Write(text);
-		if (!string.IsNullOrEmpty(text))
+		if (string.IsNullOrEmpty(text))
 		{
-			isMidLine = true;
+			return;
 		}
+
+		IndentedTextWriter.Write(text);
+		isMidLine = true;
 	}
 
 	/// <summary>