From b4b6ac05b4a05a6038de344b8e627a084d86cb52 Mon Sep 17 00:00:00 2001
From: Bela VanderVoort <bela.vandervoort@optimizely.com>
Date: Tue, 8 Feb 2022 14:47:34 -0600
Subject: [PATCH] Handles an edge case from #580

---
 .../FormattingTests/TestFiles/Comments_EdgeCase.cst        | 7 +++++++
 .../TestFiles/Comments_EdgeCase.expected.cst               | 7 +++++++
 Src/CSharpier/DocPrinter/DocPrinter.cs                     | 5 +++--
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/Src/CSharpier.Tests/FormattingTests/TestFiles/Comments_EdgeCase.cst b/Src/CSharpier.Tests/FormattingTests/TestFiles/Comments_EdgeCase.cst
index b4b599a27..a9e7941e8 100644
--- a/Src/CSharpier.Tests/FormattingTests/TestFiles/Comments_EdgeCase.cst
+++ b/Src/CSharpier.Tests/FormattingTests/TestFiles/Comments_EdgeCase.cst
@@ -15,4 +15,11 @@ public class ClassName
 	/// Tabs here
 	/// </summary>
     public class ClassName { }
+}
+
+public interface Interface
+{
+		/// <summary>
+		///	</summary> tab here before <
+		void Method();
 }
\ No newline at end of file
diff --git a/Src/CSharpier.Tests/FormattingTests/TestFiles/Comments_EdgeCase.expected.cst b/Src/CSharpier.Tests/FormattingTests/TestFiles/Comments_EdgeCase.expected.cst
index 589389fbc..5ed614d4f 100644
--- a/Src/CSharpier.Tests/FormattingTests/TestFiles/Comments_EdgeCase.expected.cst
+++ b/Src/CSharpier.Tests/FormattingTests/TestFiles/Comments_EdgeCase.expected.cst
@@ -17,3 +17,10 @@ public class ClassName
     /// </summary>
     public class ClassName { }
 }
+
+public interface Interface
+{
+    /// <summary>
+    ///	</summary> tab here before <
+    void Method();
+}
diff --git a/Src/CSharpier/DocPrinter/DocPrinter.cs b/Src/CSharpier/DocPrinter/DocPrinter.cs
index 4a7babc20..2143f81f1 100644
--- a/Src/CSharpier/DocPrinter/DocPrinter.cs
+++ b/Src/CSharpier/DocPrinter/DocPrinter.cs
@@ -187,9 +187,10 @@ private void AppendComment(LeadingComment leadingComment, Indent indent)
             //  *  keeps the * in line
             //  */
             var firstLineIndentLength =
-                firstLine!.Replace("\t", "    ").Length - firstLine.TrimStart().Length;
+                firstLine!.Replace("\t", "    ").Length
+                - firstLine.TrimStart().Replace("\t", "    ").Length;
             var secondLineIndentLength =
-                line.Replace("\t", "    ").Length - line.TrimStart().Length;
+                line.Replace("\t", "    ").Length - line.TrimStart().Replace("\t", "    ").Length;
             extraIndent = new string(
                 ' ',
                 Math.Max(secondLineIndentLength - firstLineIndentLength, 0)