Gets the kind of the 'match-threads' search statement of the expression as recognized by the last rebuild_sync call, as one of the MatchThreadsKind values.
When it's other than camel_match_threads_kind_none, the caller should gather thread-related data with add_match_threads_items_sync, after which the caller filters the output to a StoreSearchIndex, which can be set back with the set_result_index.
| this | |
| out_flags |
bit-or of FolderThreadFlags |
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one of the MatchThreadsKind constants, referencing the requested match-threads search |