Run a search.
Search must have had Folder already set on it, and it must implement summaries.
| this | |
| expr |
a search expression to run |
| uids |
to search against, NULL for all uid's. |
| cancellable |
a Cancellable |
|
a GenericArray with matching UIDs, or null on error. Use free_result to free it when no longer needed. |