Added a new feature that lets you copy the contents of column headers by using 3 new context menu options: "Copy with headers", "Copy with group headers", and "Copy headers only". #2288
Added 4 new API methods for copying column headers programmatically: copyCellsOnly(), copyWithColumnHeaders(), copyWithAllColumnHeaders(), and copyColumnHeadersOnly(). #2288
Added missing TypeScript definitions of the CellCoords and CellRange classes, which are used in the arguments of some of the APIs. #9755
Added missing TypeScript definitions for the following Handsontable hooks: beforeColumnFreeze, afterColumnFreeze, beforeColumnUnfreeze, and afterColumnUnfreeze. #9859

Fixed an issue where the UndoRedo plugin didn't work properly with preconfigured columns. #10108
Fixed an issue where formulas inserted programmatically by using updateData() were not evaluated. #10011
Fixed a regression where setting a column's type could overwrite other custom-defined settings. #10128
Fixed an issue where Handsontable didn't render properly when initialized inside of a hidden container. #5322
Fixed an issue of desynchronization between configuration options (cell meta) and Handsontable's data. The issue occurred when Handsontable's options were modified through the following hooks: beforeCreateRow, afterCreateRow, beforeCreateCol, and afterCreateCol. #10136
Fixed an issue where comments added to fixed columns didn't display properly after scrolling. #9645
Fixed an issue where typing in a dropdown editor caused the IME to disappear, resulting in wrong characters being typed. #9672
React: Fixed an issue where dropdown cells weren't validated properly when using the HotColumn component. #10065