[Cin] emulation of middle mouse button via xinput

[Andrew Randrianasulu]

Because I also run cin on laptop (for now) I found this info useful

https://dev.to/bramaudi/enabling-mouse-middle-click-emulation-in-linux-23nb

also, if you accidently try to capture too big area (for example 1600x1200
vs real 1600x900) you will get black capture window and some X errors on
console...
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