Informs the controller that the composition should be committed.
- macOS 10.5+
The client object requesting the input method to commit the composition.
If an input method implements this method, it is called when the client wants to end the composition session immediately. A typical response would be to call the
insert method of the client and then clean up any per-session buffers and variables. After receiving this message an input method should consider the given composition session finished.