Changes the size request of the editable to be about the
right size for @n_chars characters.
Note that it changes the size request, the size can still
be affected by how you pack the widget into containers.
If @n_chars is -1, the size reverts to the default size.
Changes the size request of the editable to be about the right size for @n_chars characters.
Note that it changes the size request, the size can still be affected by how you pack the widget into containers. If @n_chars is -1, the size reverts to the default size.