Bugfix: (manual merge from a pull request from amironov) Work item GH-82 - PHPExcel_Worksheet::getCellCollection() may not return last cached cell

Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php

@@ -42,7 +42,7 @@ class PHPExcel_CachedObjectStorage_MemorySerialized extends PHPExcel_CachedObjec
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -104,6 +104,20 @@ class PHPExcel_CachedObjectStorage_MemorySerialized extends PHPExcel_CachedObjec
 	}	//	function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
 	/**
 	 * Clear the cell collection and disconnect from our parent
 	 *