Queries the known snippets for the first matching group, language_id, and/or trigger.
If group or language_id are null, they will be ignored.
a group name or null
a #GtkSourceLanguage:id or null
the trigger for the snippet
a #GtkSourceSnippet or null if no matching snippet was found.
Queries the known snippets for the first matching group, language_id, and/or trigger.
If group or language_id are null, they will be ignored.