From 0245f6ba224cbb9fb5dc80c653b2d9c6da1a2ab2 Mon Sep 17 00:00:00 2001
From: oleibman <10341515+oleibman@users.noreply.github.com>
Date: Fri, 9 May 2025 20:58:06 -0700
Subject: [PATCH] Removing Columns/Rows Containing Merged Cells

Fix #282, which went stale over 7 years ago, and is now reopened. This is certainly related to issue #4379. If merged cells are in the midst of deleted rows/columns, the merge may continue to exist after the deletion, leading to various problems including spreadsheet corruption. The problem is not with either Reader or Writer.

This PR will automatically unmerge all merged cells whose first cell is in the delete range before performing the deletion. This will address the corruption problem. Something more sophisticated may be required, so I won't merge this PR for a while to give me a chance to think about it some more.
---
 src/PhpSpreadsheet/Worksheet/Worksheet.php    |  28 +++++++++++
 .../Worksheet/MergeCellsDeletedTest.php       |  45 ++++++++++++++++++
 tests/data/Reader/XLSX/issue.282.xlsx         | Bin 0 -> 11145 bytes
 3 files changed, 73 insertions(+)
 create mode 100644 tests/PhpSpreadsheetTests/Worksheet/MergeCellsDeletedTest.php
 create mode 100644 tests/data/Reader/XLSX/issue.282.xlsx

diff --git a/src/PhpSpreadsheet/Worksheet/Worksheet.php b/src/PhpSpreadsheet/Worksheet/Worksheet.php
index e9e0d78c6..3703f0003 100644
--- a/src/PhpSpreadsheet/Worksheet/Worksheet.php
+++ b/src/PhpSpreadsheet/Worksheet/Worksheet.php
@@ -2392,6 +2392,20 @@ class Worksheet
         if ($row < 1) {
             throw new Exception('Rows to be deleted should at least start from row 1.');
         }
+        $startRow = $row;
+        $endRow = $startRow + $numberOfRows - 1;
+        $removeKeys = [];
+        foreach ($this->mergeCells as $key => $value) {
+            if (preg_match('/^[a-z]{1,3}(\d+)/i', $key, $matches) === 1) {
+                $startMergeInt = (int) $matches[1];
+                if ($startMergeInt >= $startRow && $startMergeInt <= $endRow) {
+                    $removeKeys[] = $key;
+                }
+            }
+        }
+        foreach ($removeKeys as $key) {
+            unset($this->mergeCells[$key]);
+        }
 
         $holdRowDimensions = $this->removeRowDimensions($row, $numberOfRows);
         $highestRow = $this->getHighestDataRow();
@@ -2448,6 +2462,20 @@ class Worksheet
         if (is_numeric($column)) {
             throw new Exception('Column references should not be numeric.');
         }
+        $startColumnInt = Coordinate::columnIndexFromString($column);
+        $endColumnInt = $startColumnInt + $numberOfColumns - 1;
+        $removeKeys = [];
+        foreach ($this->mergeCells as $key => $value) {
+            if (preg_match('/^[a-z]{1,3}/i', $key, $matches) === 1) {
+                $startMergeInt = Coordinate::columnIndexFromString($matches[0]);
+                if ($startMergeInt >= $startColumnInt && $startMergeInt <= $endColumnInt) {
+                    $removeKeys[] = $key;
+                }
+            }
+        }
+        foreach ($removeKeys as $key) {
+            unset($this->mergeCells[$key]);
+        }
 
         $highestColumn = $this->getHighestDataColumn();
         $highestColumnIndex = Coordinate::columnIndexFromString($highestColumn);
diff --git a/tests/PhpSpreadsheetTests/Worksheet/MergeCellsDeletedTest.php b/tests/PhpSpreadsheetTests/Worksheet/MergeCellsDeletedTest.php
new file mode 100644
index 000000000..731c03671
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Worksheet/MergeCellsDeletedTest.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Worksheet;
+
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx as XlsxReader;
+use PHPUnit\Framework\TestCase;
+
+class MergeCellsDeletedTest extends TestCase
+{
+    public function testDeletedColumns(): void
+    {
+        $infile = 'tests/data/Reader/XLSX/issue.282.xlsx';
+        $reader = new XlsxReader();
+        $spreadsheet = $reader->load($infile);
+        $sheet = $spreadsheet->getSheetByName('Sheet1');
+
+        $mergeCells = $sheet->getMergeCells();
+        self::assertSame(['B1:F1', 'G1:I1'], array_values($mergeCells));
+
+        // Want to delete column B,C,D,E,F
+        $sheet->removeColumnByIndex(2, 5);
+        $mergeCells2 = $sheet->getMergeCells();
+        self::assertSame(['B1:D1'], array_values($mergeCells2));
+        $spreadsheet->disconnectWorksheets();
+    }
+
+    public function testDeletedRows(): void
+    {
+        $infile = 'tests/data/Reader/XLSX/issue.282.xlsx';
+        $reader = new XlsxReader();
+        $spreadsheet = $reader->load($infile);
+        $sheet = $spreadsheet->getSheetByName('Sheet2');
+
+        $mergeCells = $sheet->getMergeCells();
+        self::assertSame(['A2:A6', 'A7:A9'], array_values($mergeCells));
+
+        // Want to delete rows 2 to 4
+        $sheet->removeRow(2, 3);
+        $mergeCells2 = $sheet->getMergeCells();
+        self::assertSame(['A4:A6'], array_values($mergeCells2));
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/data/Reader/XLSX/issue.282.xlsx b/tests/data/Reader/XLSX/issue.282.xlsx
new file mode 100644
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