Completes the existing composition by applying the current composition
node contents. If |keep_selection| is false (0) the current selection, if
any, will be discarded. See comments on ImeSetComposition for usage. This
function is only used when window rendering is disabled.
Completes the existing composition by applying the current composition node contents. If |keep_selection| is false (0) the current selection, if any, will be discarded. See comments on ImeSetComposition for usage. This function is only used when window rendering is disabled.