Breaking Change

• Change the data type for the ConditionalFormatOptions structure field Format as a pointer, resolve issue #1867

Notable Features

• Add new functions DeleteSlicer and GetSlicers, related issue #810
• Add new function MoveSheet to support changing sheet order in the workbook, related issue #1076
• Add new AutoFitIgnoreAspect field in the GraphicOptions data type support for fill the cell with the image and ignore its aspect ratio
• Add new TickLabelPosition field in the ChartAxis data type support for set label position of the chart
• Add new fields ShowAll, InsertBlankRow and NumFmt field in the PivotTableField data type
• Add new fields ClassicLayout, FieldPrintTitles and ItemPrintTitles in the PivotTableOptions data type
• Introduce 2 new exported enumeration type ChartTickLabelPositionType and PictureInsertType
• Introduce new exported ChartLineUnset enumeration value
• Introduce 4 constants ExtURIDataField, ExtURIPivotField, ExtURIPivotFilter and ExtURIPivotHierarchy
• Introduce new exported error variable ErrPivotTableClassicLayout
• The MergeCell function support clear slave cells value when merging cells
• The AddDataValidation, DeleteDataValidation and GetCellStyle functions support concurrency safe, related issues #1825
• The GetDataValidations function support get data validations which storage in the extension lists, related issue #1835
• The SetSheetName function support case sensitivity, related issue #1856
• The GetPictureCells and GetPictures functions support for get the cell images inserted by IMAGE formula function and absolute paths for pictures
• The SetCellHyperLink function support remove hyperlink by None linkType, related issue #1940
• The AddChart function support create combo chart with same types, related issue #1940
• The AddChart function support set line type of scatter chart
• An error will be return if column header cell is empty in pivot table data range when create pivot table by AddPivotTable function, related issue #1945
• Add support for applying number format expression with language/location tags and ID
• Add support for apply number format for time and duration cell value, related issue #2004
• New support formula function: DOLLAR

Improve the Compatibility

• Improve compatibility for apply number format, support apply number format with alignment, resolve issue #1847
• Improvement compatibility for the workbook internal part with a spreadsheet namespace prefix, resolve issue #1886
• Improve compatibility for the workbook internal media files with absolute path, resolve issue #1888

Bug Fixes

• Fix a v2.8.1 regression bug, auto filter doesn't work in the LibreOffice, resolve issue #1830
• Fix a v2.8.1 regression bug, support to adjust data validation with multiple cell range, resolve issue #1831
• Fix a v2.8.1 regression bug, error on duplicate rows, if conditional formatting or data validation has multiple cell range reference
• Fix a v2.8.1 regression bug, incorrect cell value written if save multiple times, resolve issue #1906
• Fix a v2.8.1 regression bug, spark lines duplicate when creating spark lines on multiple sheets, resolve issue #1910
• The CalcCellValue function support calculate formula functions ISNUMBER, OR and FIND with matrix arguments, resolve issue #1819
• Fix the CalcCellValue function calculation result round issue, resolve issue #1851
• Fix the CalcCellValue function returns incorrect result of formula functions XIRR and XNPV, resolve issue #1989
• Fix the RemoveCol returns error when deleting columns, resolve issue #1829
• Fix incorrect result data type of the DATE formula function, resolve issue #1833
• Fix panic on read workbook with internal row element without r attribute
• Fix parentheses in formulas get cut out when inserting new columns or rows, resolve issue #1861
• Fix incorrect data validation escape result in some cases
• Fix some character can't be displayed in stream writer, resolve issue #1865
• Saving workbook with sorted internal part path to keep same hash of identical files and fix incorrect MIME type, resolve issue #1889
• Fix the AddChart function set axis format doesn't work in combo chart, resolve issue #1921
• Fix the AddChart function set incorrect primary axis titles position
• Fix the AddChart function set secondary vertical axis title is not displayed, resolve issue #1926
• Fix the AddChart function set line type of line chart does not work
• Fix the GetPivotTables function returns incorrect data range, resolve issue #1937
• Fix the GetStyle function panic when theme without sysClr, resolve issue #1963
• Fix the GetCellRichText function returns error when read cell without SST index, resolve issue #1999
• Fix the SetSheetVisible function panic on none views sheet, resolve issue #1969
• Fix percent sign missing in formatted result for zero numeric cell value, resolve issue #1942
• Fix missing horizontal axis in scatter chart with negative values
• Fix missing shape macro missing after adjusted drawing object, resolve issue #1957
• Fix missing conditional formatting after remove column in some cases, resolve issue #1968
• Fix read cell value with decimal value round issue, resolve issue #1979
• Support to set cell value with an IEEE 754 "not-a-number" value or infinity, resolve issue #119

Performance

• Fix v2.8.0 regression speed slowdown and memory usage increase issue
• Reduce memory usage for the GetRows function, related issue #1874
• Optimize ColumnNumberToName function performance, reduce about 50% memory usage and 50% time cost

Miscellaneous

• The dependencies module has been updated
• Unit tests and godoc updated
• Documentation website with multilingual: Arabic, German, English, Spanish, French, Japanese, Korean, Portuguese, Russian, Chinese Simplified and Chinese Traditional, which has been updated. Added Italian version of the document

Thank you

• mirgong (helloWorld)
• YueChenXu-Kimi (岳晨旭)
• JackMin1314 (陈王)
• paolobarbolini (Paolo Barbolini)
• iEvan-lhr (Evan lu)
• yetyear (yeahyear)
• ha5ky (hu5ky)
• lizhichao (vic)
• realzuojianxiang (realzuojianxiang)
• msackman (Matthew Sackman)
• yyle88 (yangyile-yyle88)
• yunkeweb (yunkeweb)
• iraj720 (Nima)
• jianxinhou
• barlevd
• 18409615759 (nna)
• qijinkui (xiaokui)
• user1121114685 (联盟少侠)
• wangsongyan
• vsemichev (Vovka Morkovka)
• zhayt (Aybek)
• ShowerBandV (ShowerBandV)
• imink (Patrick Wang)
• samkeke (wxy)
• pjh591029530
• zhangyimingdatiancai
• wanghaochen2024
• centurion-hub
• peng (Zhang Zhipeng)
• slashdotdash (Ben Smith)
• ArcholSevier
• liuwangchao
• Zncl2222 (Jian Yu, Chen)