get_completion_suffix

Description:

public string? get_completion_suffix (string initial_text)

Obtains a suffix completion for initial_text from this.

Suffix will be an empty string if there's no shared suffix among matching completions. If there's no matching completions anyway, `NULL` is returned.

Parameters:

this

the filename completer.
initial_text

text to be completed.

Returns:

a suffix completion string, or `NULL` if no completion exists.