Respect DataType in insertNewBefore (#2433)

`ReferenceHelper::insertNewBefore` copies data from one cell to another when adding/removing rows or columns.
It now also respects the data type set for that cell and does not use value binder again.

src/PhpSpreadsheet/ReferenceHelper.php

@@ -426,7 +426,7 @@ class ReferenceHelper
                         ->setValue($this->updateFormulaReferences($cell->getValue(), $beforeCellAddress, $numberOfColumns, $numberOfRows, $worksheet->getTitle()));
                 } else {
                     // Formula should not be adjusted
-                    $worksheet->getCell($newCoordinate)->setValue($cell->getValue());
+                    $worksheet->getCell($newCoordinate)->setValueExplicit($cell->getValue(), $cell->getDataType());
                 }
 
                 // Clear the original cell

tests/PhpSpreadsheetTests/ReferenceHelperTest.php

@@ -2,7 +2,9 @@
 
 namespace PhpOffice\PhpSpreadsheetTests;
 
+use PhpOffice\PhpSpreadsheet\Cell\DataType;
 use PhpOffice\PhpSpreadsheet\ReferenceHelper;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PHPUnit\Framework\TestCase;
 
 class ReferenceHelperTest extends TestCase
@@ -129,4 +131,22 @@ class ReferenceHelperTest extends TestCase
     {
         return require 'tests/data/ReferenceHelperFormulaUpdatesMultipleSheet.php';
     }
+
+    public function testInsertNewBeforeRetainDataType(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $cell = $sheet->getCell('A1');
+        $cell->setValueExplicit('+1', DataType::TYPE_STRING);
+        $oldDataType = $cell->getDataType();
+        $oldValue = $cell->getValue();
+
+        $sheet->insertNewRowBefore(1);
+        $newCell = $sheet->getCell('A2');
+        $newDataType = $newCell->getDataType();
+        $newValue = $newCell->getValue();
+
+        self::assertSame($oldValue, $newValue);
+        self::assertSame($oldDataType, $newDataType);
+    }
 }