Code review changes

src/Spout/Writer/Common/Manager/Style/ManagedStyle.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Box\Spout\Writer\Common\Manager\Style;
+
+use Box\Spout\Common\Entity\Style\Style;
+
+class ManagedStyle
+{
+    private $style;
+    private $isUpdated;
+
+    public function __construct(Style $style, bool $isUpdated)
+    {
+        $this->style = $style;
+        $this->isUpdated = $isUpdated;
+    }
+
+    public function getStyle() : Style
+    {
+        return $this->style;
+    }
+
+    public function isUpdated() : bool
+    {
+        return $this->isUpdated;
+    }
+}

src/Spout/Writer/Common/Manager/Style/StyleManager.php

@@ -50,9 +50,9 @@ class StyleManager implements StyleManagerInterface
      * Typically, set "wrap text" if a cell contains a new line.
      *
      * @param Cell $cell
-     * @return Style|null The eventually updated style
+     * @return ManagedStyle The eventually updated style
      */
-    public function applyExtraStylesIfNeeded(Cell $cell) : ?Style
+    public function applyExtraStylesIfNeeded(Cell $cell) : ManagedStyle
     {
         return $this->applyWrapTextIfCellContainsNewLine($cell);
     }
@@ -67,23 +67,19 @@ class StyleManager implements StyleManagerInterface
      *        on the Windows version of Excel...
      *
      * @param Cell $cell The cell the style should be applied to
-     * @return Style|null The eventually updated style
+     * @return ManagedStyle The eventually updated style
      */
-    protected function applyWrapTextIfCellContainsNewLine(Cell $cell) : ?Style
+    protected function applyWrapTextIfCellContainsNewLine(Cell $cell) : ManagedStyle
     {
         $cellStyle = $cell->getStyle();
 
         // if the "wrap text" option is already set, no-op
-        if ($cellStyle->hasSetWrapText()) {
-            return null;
-        }
-
-        if ($cell->isString() && \strpos($cell->getValue(), "\n") !== false) {
+        if (!$cellStyle->hasSetWrapText() && $cell->isString() && \strpos($cell->getValue(), "\n") !== false) {
             $cellStyle->setShouldWrapText();
 
-            return $cellStyle;
+            return new ManagedStyle($cellStyle, true);
         }
 
-        return null;
+        return new ManagedStyle($cellStyle, false);
     }
 }

src/Spout/Writer/Common/Manager/Style/StyleManagerInterface.php

@@ -24,7 +24,7 @@ interface StyleManagerInterface
      * Typically, set "wrap text" if a cell contains a new line.
      *
      * @param Cell $cell
-     * @return Style|null The eventually updated style
+     * @return ManagedStyle|null The eventually updated style
      */
-    public function applyExtraStylesIfNeeded(Cell $cell) : ?Style;
+    public function applyExtraStylesIfNeeded(Cell $cell) : ManagedStyle;
 }

src/Spout/Writer/Common/Manager/Style/StyleRegistry.php

@@ -114,8 +114,7 @@ class StyleRegistry
     {
         // In order to be able to properly compare style, set static ID value and reset registration
         $currentId = $style->getId();
-        $style->setId(0);
-        $style->setRegistered(false);
+        $style->unregister();
 
         $serializedStyle = \serialize($style);