Explicitly stops the editing of the currently edited cell.
If canceled is true, the currently edited cell renderer will emit the
GtkCellArea::editing-canceled signal, otherwise the the GtkCellArea::editing-done signal will be emitted on the
current edit widget.
See get_edited_cell and get_edit_widget.
| this |
a `GtkCellArea` |
| canceled |
whether editing was canceled. |