[ Version ( since = "3.4" ) ]
public string? compute_prefix (string key)
Computes the common prefix that is shared by all rows in this that start with key.
GtkEntryCompletion will be removed in GTK 5.
If no row matches key, null will be returned. Note that a text column must have been set
for this function to work, see [method@Gtk.EntryCompletion.set_text_column] for details.
| this |
the entry completion |
| key |
The text to complete for |
|
The common prefix all rows starting with |