Currently, row/column groups cannot be collapsed/expanded through the public API. User should be able to specify row's/column's "collapsed" attribute indicating whether the outlining is in a collapsed state.

Removing/adding rows/columns inside a worksheet requires all the data after them to be translated according to the change. This operation is slow and affects editing performance.

Currently, the chart lines support only solid fill for their outlines.

The API should be able to provide a way to move the X-axis away from the 0 value on the Y-axis or to the bottom of the chart when there are negative Y-axis values.

In Excel this can be achieved by right click on the axis, then from the context menu select "Format Axis".  Go to the "Labels" group and then in the "Label position" field select the desired value.

The COUNTIFS function returns the count of cells that meet one or more criteria.

Sometimes the customers need to obtain the result of a formula without adding it as a value to a specific cell.

Provide an API used to recalculate all formulas in the document similar to the Excel Interop Calculate function

Exporting empty workbook without any worksheet is not allowed according to the specification and such documents cannot be opened in Excel. Ensure the customers cannot create such documents using the API of SpreadProcessing.

The AlternateContent element is used to store content which is not defined by the specification.

If the lookup_value parameter and lookup_vector parameters refer cells containing text values, the function returns a Not available error ("#N/A").

ArgumentException is thrown when importing documents containing empty values

The value formula =Round(1.015, 2) returns 1.01 which is incorrect. Excel returns 1.02.

Add support for Point Markes customization options for the Charts.

Add support for Hidden and Empty Cells options:

https://support.office.com/en-us/article/display-empty-cells-null-n-a-values-and-hidden-worksheet-data-in-a-chart-a1ee6f0c-192f-4248-abeb-9ca49cb92274

The data validation rule should have values for formula1 and formula2 elements, which define the start and end values for a range to validate between. When such values are missing, a NullReferenceException is thrown on import and the document cannot be imported.

Details:

When the worksheet contains fraction numbers with fractional parts > 0.5 and < 0.5 and both these numbers have fraction format applied, the number with fractional part < 0.5 will have incorrect whole part.

The row declaration is the following:

<row r="8" spans="1:18" ht="15.75" x14ac:dyDescent="0.25">

The dyDescent attribute is described as follows:

The dyDescent attribute is a double attribute, as specified in [XMLSCHEMA2/2] section 3.2.5, that specifies the vertical distance in pixels from the bottom of the cells in the current row to the typographical baseline of the cell content if, hypothetically, the zoom level for the sheet containing this row is 100 percent and the cell has bottom-alignment formatting. See section 2.2.4.12 for how this element integrates with the Office Open XML file formats specified in [ISO/IEC29500-1:2016]. The dyDescent attribute has a side effect; it sets the customHeight attribute to true even if the customHeight attribute is explicitly set to false. 

Note: Since the dyDescent attribute is not implemented, the height is not recognized to be custom and therefore it is not imported at all. The row has the default height.

Closed as duplicate. Please, follow the item at https://feedback.telerik.com/Project/184/Feedback/Details/190249 .

When the workbook contains multiple styles (e.g. 50000), the import is extremely slow. MS Excel loads this document instantaneously.

Incorrect calculation of Round function returns wrong results in some cases. For example, test Microsoft Excel and Spreadsheet results of: ROUND(1.365, 2) to see the discrepancy.

Available in R3 2018 SP1 release.