From 4354a49e5b7ec6dcf0089bd709ed9df90d3d5ba2 Mon Sep 17 00:00:00 2001
From: upstream <upstream@localhost>
Date: Fri, 4 Sep 2026 09:31:11 +0200
Subject: [PATCH] Upstream thephpleague/csv state of the touched files before
 3426bb277e

---
 src/Buffer.php     | 13 +++++++++----
 src/BufferTest.php | 18 ------------------
 2 files changed, 9 insertions(+), 22 deletions(-)

diff --git a/src/Buffer.php b/src/Buffer.php
index 843c219..d4083c2 100644
--- a/src/Buffer.php
+++ b/src/Buffer.php
@@ -335,11 +335,16 @@ final class Buffer implements TabularData
     private function nthRow(int $nth, string $method): array
     {
         -1 < $nth || throw InvalidArgument::dueToInvalidRecordOffset($nth, $method);
+        if (null === ($first = $this->firstOffset())) {
+            return [];
+        }
 
-        // $nth is a positional index (like ResultSet::nth), so it must be
-        // resolved against the record order rather than the row keys, which
-        // may contain gaps after records have been deleted.
-        return array_values($this->rows)[$nth] ?? [];
+        $offset = $first + $nth;
+        if (!array_key_exists($offset, $this->rows)) {
+            return [];
+        }
+
+        return $this->rows[$nth + $first];
     }
 
     public function fetchColumn(int|string $index = 0): Iterator
diff --git a/src/BufferTest.php b/src/BufferTest.php
index 8c19af1..e373f7e 100644
--- a/src/BufferTest.php
+++ b/src/BufferTest.php
@@ -285,24 +285,6 @@ final class BufferTest extends TestCase
         self::assertSame(['date' => '2025-02-08', 'temperature' => '3', 'place' => 'Berkeley'], $buffer->nth(0));
     }
 
-    #[Test]
-    public function it_returns_records_by_positional_offset_after_a_middle_record_is_deleted(): void
-    {
-        $buffer = new Buffer(['id', 'name']);
-        $buffer->insert(['1', 'a'], ['2', 'b'], ['3', 'c'], ['4', 'd'], ['5', 'e']);
-
-        // Delete the second record (id = 2), which leaves a gap in the row keys.
-        self::assertSame(1, $buffer->delete(fn (array $row): bool => $row['id'] === '2'));
-        self::assertSame(4, $buffer->recordCount());
-
-        // nth() is positional and must stay consistent with getRecords().
-        self::assertSame(['id' => '1', 'name' => 'a'], $buffer->nth(0));
-        self::assertSame(['id' => '3', 'name' => 'c'], $buffer->nth(1));
-        self::assertSame(['id' => '4', 'name' => 'd'], $buffer->nth(2));
-        self::assertSame(['id' => '5', 'name' => 'e'], $buffer->nth(3));
-        self::assertSame([], $buffer->nth(4));
-    }
-
     #[Test]
     public function it_can_not_insert_invalid_records(): void
     {