Sets the current header of the row. This is only allowed to be called from a GtkListBoxUpdateHeaderFunc It will replace any existing header in the row, and be shown in front of the row in the listbox.
the header, or NULL
3.10
Sets the current header of the row. This is only allowed to be called from a GtkListBoxUpdateHeaderFunc It will replace any existing header in the row, and be shown in front of the row in the listbox.