Computes the common prefix that is shared by all rows in completion
that start with key. If no row matches key, NULL will be returned.
Note that a text column must have been set for this function to work,
see Entry.completionSetTextColumn for details.
Computes the common prefix that is shared by all rows in completion that start with key. If no row matches key, NULL will be returned. Note that a text column must have been set for this function to work, see Entry.completionSetTextColumn for details.