I could imagine an option "Do not quit onboard when closing the keyboard window", but I am still reluctant to add it because there already is the minimize button to hide onboard. Moreover, I suppose that after using the minimize button for some time, it will become a habit to use it instead of the close button.
Thus, I do not see a real compelling reason to add your patch (or more precisely my updated version of the patch because your was using an older version of onboard) to onboard; but I will leave the thread open for the other maintainers in case they see it differently.
I could imagine an option "Do not quit onboard when closing the keyboard window", but I am still reluctant to add it because there already is the minimize button to hide onboard. Moreover, I suppose that after using the minimize button for some time, it will become a habit to use it instead of the close button.
Thus, I do not see a real compelling reason to add your patch (or more precisely my updated version of the patch because your was using an older version of onboard) to onboard; but I will leave the thread open for the other maintainers in case they see it differently.