Merge pull request #4620 from SpikedCola/Fix-Newline-Corruption

Fix "Excel2007 found unreadable content" when saving a file that contains a newline

Author: oleibman

src/PhpSpreadsheet/Shared/StringHelper.php

@@ -19,11 +19,8 @@ class StringHelper
         "\x06",
         "\x07",
         "\x08",
-        "\x09",
-        "\x0a",
         "\x0b",
         "\x0c",
-        "\x0d",
         "\x0e",
         "\x0f",
         "\x10",
@@ -53,11 +50,8 @@ class StringHelper
         '_x0006_',
         '_x0007_',
         '_x0008_',
-        '_x0009_',
-        '_x000A_',
         '_x000B_',
         '_x000C_',
-        '_x000D_',
         '_x000E_',
         '_x000F_',
         '_x0010_',