From cd5a93b80428a22a12aa0999d988ca527cc2596b Mon Sep 17 00:00:00 2001
From: Omar Bonnet <obonnet@techsola.com>
Date: Mon, 18 Nov 2024 01:21:40 -0500
Subject: [PATCH] Fix switch indentation for list patterns

- fixes #72196
---
 .../CSharpTest/Formatting/FormattingTests.cs  | 28 +++++++++++++++++++
 .../Rules/IndentBlockFormattingRule.cs        | 10 +++++++
 2 files changed, 38 insertions(+)

diff --git a/src/Workspaces/CSharpTest/Formatting/FormattingTests.cs b/src/Workspaces/CSharpTest/Formatting/FormattingTests.cs
index a6668e8b9a77c..9cdc7c0c97708 100644
--- a/src/Workspaces/CSharpTest/Formatting/FormattingTests.cs
+++ b/src/Workspaces/CSharpTest/Formatting/FormattingTests.cs
@@ -5605,6 +5605,34 @@ public object Method(int i)
             await AssertFormatAsync(expectedCode, code);
         }
 
+        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/72196")]
+        public async Task FormatSwitchExpression_ListPatternAligned()
+        {
+            var code = @"class C
+{
+    void M()
+    {
+        _ = Array.Empty<string>() switch
+        {
+        [] => 0,
+            _ => 1,
+        };
+    }
+}";
+            var expectedCode = @"class C
+{
+    void M()
+    {
+        _ = Array.Empty<string>() switch
+        {
+            [] => 0,
+            _ => 1,
+        };
+    }
+}";
+            await AssertFormatAsync(expectedCode, code);
+        }
+
         [Fact]
         public async Task FormatSwitchWithPropertyPattern()
         {
diff --git a/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Formatting/Rules/IndentBlockFormattingRule.cs b/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Formatting/Rules/IndentBlockFormattingRule.cs
index d6331a303a26d..da7ddb4592b41 100644
--- a/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Formatting/Rules/IndentBlockFormattingRule.cs
+++ b/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Formatting/Rules/IndentBlockFormattingRule.cs
@@ -262,6 +262,11 @@ private static void AddBracketIndentationOperation(List<IndentBlockOperation> li
             // Brackets in list patterns are formatted like blocks, so align close bracket with open bracket
             AddIndentBlockOperation(list, bracketPair.openBracket.GetNextToken(includeZeroWidth: true), bracketPair.closeBracket.GetPreviousToken(includeZeroWidth: true));
 
+            if (IsSwitchExpressionPattern(node))
+            {
+                return;
+            }
+
             // If we have:
             //
             // return Goo([ //<-- determining indentation here.
@@ -279,6 +284,11 @@ private static void AddBracketIndentationOperation(List<IndentBlockOperation> li
         }
     }
 
+    private static bool IsSwitchExpressionPattern(SyntaxNode node)
+    {
+        return node.Parent is SwitchExpressionArmSyntax arm && arm.Pattern == node;
+    }
+
     private static void AddAlignmentBlockOperationRelativeToFirstTokenOnBaseTokenLine(List<IndentBlockOperation> list, (SyntaxToken openBrace, SyntaxToken closeBrace) bracePair)
     {
         var option = IndentBlockOption.RelativeToFirstTokenOnBaseTokenLine;