Fix issue with prepending zero in percentage

Before it was a bug when flooring negative numbers added to the length of
the number for the sprintf mask.
For example -0.091 becomes -9.1 in percentage, floors to -10 which is going to
increase $wholePartSize by 1 and add a leading zero to the result: -09.1% with
format 0.0%.
This happened for negative ranges where floor will increse the length of
the original number.

Author: nicholasruunu

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com)
 and this project adheres to [Semantic Versioning](https://semver.org).
 
-## 2.0.0 - 2024-01-24
+## Unreleased - TBD
 
 ### Added
 
@@ -29,6 +29,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Changes to floating point in Php8.4. [Issue #3896](https://github.com/PHPOffice/PhpSpreadsheet/issues/3896) [PR #3897](https://github.com/PHPOffice/PhpSpreadsheet/pull/3897)
 - Handling User-supplied Decimal and Thousands Separators. [Issue #3900](https://github.com/PHPOffice/PhpSpreadsheet/issues/3900) [PR #3903](https://github.com/PHPOffice/PhpSpreadsheet/pull/3903)
 - Improve Performance of CSV Writer. [Issue #3904](https://github.com/PHPOffice/PhpSpreadsheet/issues/3904) [PR #3906](https://github.com/PHPOffice/PhpSpreadsheet/pull/3906)
+- Fix issue with prepending zero in percentage [Issue #3920](https://github.com/PHPOffice/PhpSpreadsheet/issues/3920) [PR #3921](https://github.com/PHPOffice/PhpSpreadsheet/pull/3921)
 
 ## 2.0.0 - 2024-01-04
 

src/PhpSpreadsheet/Style/NumberFormat/PercentageFormatter.php

@@ -20,7 +20,7 @@ public static function format($value, string $format): string
         $vDecimalCount = strlen(rtrim($vDecimals, '0'));
 
         $format = str_replace('%', '%%', $format);
-        $wholePartSize = strlen((string) floor($value));
+        $wholePartSize = strlen((string) floor(abs($value)));
         $decimalPartSize = 0;
         $placeHolders = '';
         // Number of decimals

tests/data/Style/NumberFormat.php

@@ -199,6 +199,26 @@
         0.123,
         '0%',
     ],
+    [
+        '-9.1%',
+        -0.091,
+        '0.0%',
+    ],
+    [
+        '-99.1%',
+        -0.991,
+        '0.0%',
+    ],
+    [
+        '-9.10%',
+        -0.091,
+        '0.00%',
+    ],
+    [
+        '-99.10%',
+        -0.991,
+        '0.00%',
+    ],
     [
         '10%',
         0.1,