Swapped Row and Column Indexes in ReferenceHelper

Fix PHPOffice#4246. This can cause an Exception in unusual circumstances.

src/PhpSpreadsheet/ReferenceHelper.php

@@ -1215,7 +1215,7 @@ private function duplicateStylesByRow(Worksheet $worksheet, int $beforeColumn, i
             if ($worksheet->cellExists($coordinate)) {
                 $xfIndex = $worksheet->getCell($coordinate)->getXfIndex();
                 for ($j = $beforeRow; $j <= $beforeRow - 1 + $numberOfRows; ++$j) {
-                    if (!empty($xfIndex) || $worksheet->cellExists([$j, $i])) {
+                    if (!empty($xfIndex) || $worksheet->cellExists([$i, $j])) {
                         $worksheet->getCell(Coordinate::stringFromColumnIndex($i) . $j)->setXfIndex($xfIndex);
                     }
                 }

tests/PhpSpreadsheetTests/ReferenceHelper5Test.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+class ReferenceHelper5Test extends TestCase
+{
+    public function testIssue4246(): void
+    {
+        // code below would have thrown exception because
+        // row and column were swapped in code
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $row = 987654;
+        $rowMinus1 = $row - 1;
+        $rowPlus1 = $row + 1;
+        $sheet->getCell("A$rowMinus1")->setValue(1);
+        $sheet->getCell("B$rowMinus1")->setValue(2);
+        $sheet->getCell("C$rowMinus1")->setValue(3);
+        $sheet->getStyle("A$rowMinus1")->getFont()->setBold(true);
+        $sheet->getCell("A$row")->setValue(1);
+        $sheet->getCell("B$row")->setValue(2);
+        $sheet->getCell("C$row")->setValue(3);
+        $sheet->getStyle("B$row")->getFont()->setBold(true);
+
+        $sheet->insertNewRowBefore($row);
+        self::assertTrue(
+            $sheet->getStyle("A$row")->getFont()->getBold()
+        );
+        self::assertFalse(
+            $sheet->getStyle("B$row")->getFont()->getBold()
+        );
+        self::assertFalse(
+            $sheet->getStyle("A$rowPlus1")->getFont()->getBold()
+        );
+        self::assertTrue(
+            $sheet->getStyle("B$rowPlus1")->getFont()->getBold()
+        );
+        $spreadsheet->disconnectWorksheets();
+    }
+}