Begins editing on a cell_editable. event is the GdkEvent that began the editing process. It may be NULL, in the instance that editing was initiated through programatic means.
A GdkEvent, or NULL. [allow-none]
See Implementation
Begins editing on a cell_editable. event is the GdkEvent that began the editing process. It may be NULL, in the instance that editing was initiated through programatic means.