remove_widget

This signal is meant to indicate that the cell is finished editing, and the cell_editable widget is being removed and may subsequently be destroyed.

Implementations of `GtkCellEditable` are responsible for emitting this signal when they are done editing. It must be emitted after the `GtkCellEditable:GtkCellEditable:editing-done` signal, to give the cell renderer a chance to update the cell's value before the widget is removed.

remove_widget is a convenience method for emitting `GtkCellEditable:GtkCellEditable:remove-widget`.