Gtk.IMContext.prototype.set_use_preedit

function set_use_preedit(use_preedit:Boolean):void {
    // Gjs wrapper for gtk_im_context_set_use_preedit()
}

Sets whether the IM context should use the preedit string to display feedback. If use_preedit is FALSE (default is TRUE), then the IM context may use some other method to display feedback, such as displaying it in a child of the root window.