Sets the text to search.
If search_text is null or is empty, the search will be disabled. A copy of
search_text will be made, so you can safely free search_text after a call to this function.
You may be interested to call [func@utils_unescape_search_text] before this function.
| this | |
| search_text |
the nul-terminated text to search, or null to disable the search. |