Xlsx Reader Warning When No sz Tag for RichText (#2550)

Fix #2542. Xlsx Reader is expecting a `sz` tag when reading RichText, but it is not required, and PhpSpreadsheet issues a warning message when it is missing.

src/PhpSpreadsheet/Reader/Xlsx.php

@@ -1691,14 +1691,18 @@ class Xlsx extends BaseReader
                     } else {
                         $objText = $value->createTextRun(StringHelper::controlCharacterOOXML2PHP((string) $run->t));
 
+                        if (isset($run->rPr->rFont)) {
                             $attr = $run->rPr->rFont->attributes();
                             if (isset($attr['val'])) {
                                 $objText->getFont()->setName((string) $attr['val']);
                             }
+                        }
+                        if (isset($run->rPr->sz)) {
                             $attr = $run->rPr->sz->attributes();
                             if (isset($attr['val'])) {
                                 $objText->getFont()->setSize((float) $attr['val']);
                             }
+                        }
                         if (isset($run->rPr->color)) {
                             $objText->getFont()->setColor(new Color($this->styleReader->readColor($run->rPr->color)));
                         }

tests/PhpSpreadsheetTests/Reader/Xlsx/Issue2542Test.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
+use PhpOffice\PhpSpreadsheet\RichText\RichText;
+use PHPUnit\Framework\TestCase;
+
+class Issue2542Test extends TestCase
+{
+    /**
+     * @var string
+     */
+    private static $testbook = 'tests/data/Reader/XLSX/issue.2542.xlsx';
+
+    public function testPreliminaries(): void
+    {
+        // Rich text without 'sz' tag
+        $file = 'zip://';
+        $file .= self::$testbook;
+        $file .= '#xl/sharedStrings.xml';
+        $data = file_get_contents($file);
+
+        // confirm that file contains expected namespaced xml tag
+        if ($data === false) {
+            self::fail('Unable to read file sharedStrings.xml');
+        } else {
+            self::assertStringContainsString('<si><r><rPr><rFont val="Arial"/><b/><color theme="1"/></rPr><t xml:space="preserve">Factor group
+</t></r><r><rPr><rFont val="Arial"/><b val="0"/><color theme="1"/></rPr><t>(for Rental items only)</t></r></si>', $data);
+        }
+    }
+
+    public function testIssue2542(): void
+    {
+        $filename = self::$testbook;
+        $reader = new Xlsx();
+        $spreadsheet = $reader->load($filename);
+        $sheet = $spreadsheet->getActiveSheet();
+        $value = $sheet->getCell('P1')->getValue();
+        if ($value instanceof RichText) {
+            self::assertSame("Factor group\n(for Rental items only)", $value->getPlainText());
+        } else {
+            self::fail('Cell P1 is not RichText');
+        }
+        $spreadsheet->disconnectWorksheets();
+    }
+}