fixed AutoFilter record size with multibyte strings.

[htoyama]

NPOI Version

2.7.0

File Type

• [ ] XLSX
• [x] XLS
• [ ] DOCX
• [ ] XLSM
• [ ] OTHER

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Reproduce Steps

Issue Description

CheckPosition throw exception. NPOI.Util.RuntimeException: 'Buffer overrun i=4;endIndex=125635;writeIndex=125633'

diff --git a/main/HSSF/Record/AutoFilter/AutoFilterRecord.cs b/main/HSSF/Record/AutoFilter/AutoFilterRecord.cs
index 227a4b1e..c43b9ca6 100644
--- a/main/HSSF/Record/AutoFilter/AutoFilterRecord.cs
+++ b/main/HSSF/Record/AutoFilter/AutoFilterRecord.cs
@@ -130,10 +130,25 @@ protected override int DataSize
             {
                 int recSize = 2 + 2 + 10 + 10;
                 if (field_3_doper1.LengthOfString > 0)
-                    recSize += 1 + field_5_rgch1.Length;
+                    if (rgch1_multibyte)
+                    {
+                        recSize += 1 + (field_5_rgch1.Length * 2); // UTF16LE
+                    }
+                    else
+                    {
+                        recSize += 1 + field_5_rgch1.Length;
+                    }

                 if(field_4_doper2.LengthOfString > 0)
-                    recSize += 1+ field_6_rgch2.Length;
+                    if (rgch2_multibyte)
+                    {
+                        recSize += 1+ (field_6_rgch2.Length * 2); // UTF16LE
+
+                    }
+                    else
+                    {
+                        recSize += 1+ field_6_rgch2.Length;
+                    }
                 return recSize;
             }
         }

[htoyama]

Book1.xls New serialize occur exception. Workbook.CloneSheet("Sheet1") Workbook.Write(New_File)