Sets surrounding context around the insertion point and preedit string.
Use [method@Gtk.IMContext.set_surrounding_with_selection] instead
This function is expected to be called in response to the [signal@Gtk.IMContext:GtkIMContext:retrieve-surrounding] signal,
and will likely have no effect if called at other times.
| this |
a `GtkIMContext` |
| text |
text surrounding the insertion point, as UTF-8. the preedit string should not be included within |
| len |
the length of |
| cursor_index |
the byte index of the insertion cursor within |