Track Cell changes

[hussamkhatib]

Feature request:
Ability to track cell changes in a similar way rows are tracked.

The Problem:
The onChange handler callback is not usefull here since it only has the newValue and indexes, which is not enough to tell which cell changed.

solution:
return the columns that are being updated as part of the onChange handler.

[nick-keller]

You can listen to the onFocus event and store which cell is beeing edited.
But since cells can depend on one another, I would suggest to diff the rowws to know which ones have changed insead of relying on the cells that is being edited. As a benefit, if a cell is edited back to its previous value this would consider it as "un-changed" ;)