Hmm, maybe only <merge key="input.x11_options.ButtonMapping" type="string">1 2 2 4 5 6 7 3 8</merge> should get changed to "1 2 3 4 5 6 7 8 9" or removed?!
Hmm, maybe only x11_options. ButtonMapping" type="string">1 2 2 4 5 6 7 3 8</merge>
<merge key="input.
should get changed to "1 2 3 4 5 6 7 8 9" or removed?!