Win For Scrutinizer

It pointed out a problem that I would have thought should result in test failure. Code corrected, and documentation updated to describe the unexpected behavior.

Author: oleibman

docs/topics/accessing-cells.md

@@ -42,7 +42,7 @@ $spreadsheet->getActiveSheet()
 If you make a call to `getCell()`, and the cell doesn't already exist, then
 PhpSpreadsheet will create that cell for you.
 
-### BEWARE: Cells assigned to variables as a Detached Reference
+### BEWARE: Cells and Styles assigned to variables as a Detached Reference
 
 As an "in-memory" model, PHPSpreadsheet can be very demanding of memory,
 particularly when working with large spreadsheets. One technique used to
@@ -54,6 +54,7 @@ While this is not normally an issue, it can become significant
 if you assign the result of a call to `getCell()` to a variable. Any
 subsequent calls to retrieve other cells will change that pointer, although
 the cell object will still retain its data values.
+This is also true when assigning a variable to the result of `getStyle()`.
 
 What does this mean? Consider the following code:
 

tests/PhpSpreadsheetTests/Writer/Xlsx/ExplicitStyle0Test.php

@@ -41,14 +41,12 @@ public function testWithoutExplicitStyle0(): void
         $reader = new XlsxReader();
         $spreadsheet2 = $reader->load($this->outputFile);
         $sheet2 = $spreadsheet2->getActiveSheet();
-        $styleA1 = $sheet2->getStyle('A1');
-        self::assertTrue($styleA1->getFont()->getBold());
-        self::assertFalse($styleA1->getFont()->getItalic());
-        self::assertSame(Alignment::HORIZONTAL_CENTER, $styleA1->getAlignment()->getHorizontal());
-        $styleA2 = $sheet2->getStyle('A2');
-        self::assertTrue($styleA1->getFont()->getBold());
-        self::assertTrue($styleA1->getFont()->getItalic());
-        self::assertSame(Alignment::HORIZONTAL_CENTER, $styleA1->getAlignment()->getHorizontal());
+        self::assertTrue($sheet2->getStyle('A1')->getFont()->getBold());
+        self::assertFalse($sheet2->getStyle('A1')->getFont()->getItalic());
+        self::assertSame(Alignment::HORIZONTAL_CENTER, $sheet2->getStyle('A1')->getAlignment()->getHorizontal());
+        self::assertTrue($sheet2->getStyle('A2')->getFont()->getBold());
+        self::assertTrue($sheet2->getStyle('A2')->getFont()->getItalic());
+        self::assertSame(Alignment::HORIZONTAL_CENTER, $sheet2->getStyle('A2')->getAlignment()->getHorizontal());
         $spreadsheet2->disconnectWorksheets();
 
         $file = 'zip://';
@@ -82,14 +80,12 @@ public function testWithExplicitStyle0(): void
         $reader = new XlsxReader();
         $spreadsheet2 = $reader->load($this->outputFile);
         $sheet2 = $spreadsheet2->getActiveSheet();
-        $styleA1 = $sheet2->getStyle('A1');
-        self::assertTrue($styleA1->getFont()->getBold());
-        self::assertFalse($styleA1->getFont()->getItalic());
-        self::assertSame(Alignment::HORIZONTAL_CENTER, $styleA1->getAlignment()->getHorizontal());
-        $styleA2 = $sheet2->getStyle('A2');
-        self::assertTrue($styleA1->getFont()->getBold());
-        self::assertTrue($styleA1->getFont()->getItalic());
-        self::assertSame(Alignment::HORIZONTAL_CENTER, $styleA1->getAlignment()->getHorizontal());
+        self::assertTrue($sheet2->getStyle('A1')->getFont()->getBold());
+        self::assertFalse($sheet2->getStyle('A1')->getFont()->getItalic());
+        self::assertSame(Alignment::HORIZONTAL_CENTER, $sheet2->getStyle('A1')->getAlignment()->getHorizontal());
+        self::assertTrue($sheet2->getStyle('A2')->getFont()->getBold());
+        self::assertTrue($sheet2->getStyle('A2')->getFont()->getItalic());
+        self::assertSame(Alignment::HORIZONTAL_CENTER, $sheet2->getStyle('A2')->getAlignment()->getHorizontal());
         $spreadsheet2->disconnectWorksheets();
 
         $file = 'zip://';