Middle button emulation -

[Bob Goodwin]

3 button emulation provides the ultimate in convenience for copy/paste, 
highlight and one click and you're done! I do not understand why fedora 
makes it so difficult to have this feature?

I have two similar computers both running Fedora 24, this one a new 
installation. On both I have added the following to 
/usr/share/X11/xorg.conf.d/10-evdev.conf:

Section "InputClass"
       Identifier "middle button emulation class"
       MatchIsPointer "on"
       Option "Emulate3Buttons" "on"
       Driver "evdev"
EndSection

On box7 this works as expected, on this new installation in box10 it 
does not.

Why not and how do I fix the problem?

Any help appreciated,

Bob