another possible fix for stack chart layouts

Author: jaek-s

src/PhpWord/Writer/Word2007/Part/Chart.php

@@ -107,8 +107,6 @@ private function writeChart(XMLWriter $xmlWriter)
 
         $this->writePlotArea($xmlWriter);
 
-        $xmlWriter->writeElementBlock('c:plotVisOnly', 'val', 1);
-
         $xmlWriter->endElement(); // c:chart
     }
 
@@ -161,6 +159,8 @@ private function writePlotArea(XMLWriter $xmlWriter)
         // Series
         $this->writeSeries($xmlWriter, isset($this->options['scatter']));
 
+        $xmlWriter->writeElementBlock('c:overlap', 'val', '100');
+
         // Axes
         if (isset($this->options['axes'])) {
             $xmlWriter->writeElementBlock('c:axId', 'val', 1);