- update to 3.1.9:
* Add fix for errant XML tag in chart leader lines for non-Pie
charts.
* Add support for formatting the data label in chart
trendlines.
* Add the :func:`very_hidden()` method to hide a worksheet.
This is similar to the :func:`hide()` method except that the
worksheet cannot be unhidden in the the Excel user interface.
The Excel worksheet "xlSheetVeryHidden" option can only be
unset programmatically via VBA.
* Added fixes for column formulas in tables that were
overridden by table data and which also didn't take future
functions into account.
* Added support for chart leader lines for chart types other
than Pie and Doughnut.
* Added support for adding signed VBA macros to workbooks via
the via the
* Added support for enabling the Excel "Show #N/A as an empty
cell" chart option via the :func:`show_na_as_empty_cell` method.
* Added support for custom total formulas to worksheet tables.
* Added worksheet page break preview mode via
:func:`set_pagebreak_view()`.
* Add support for new Excel dynamic functions added in 2023.
* Added support for adding a color to the `invert_if_negative`
chart option.
* Minor fix for cell color issue.