https://bugzilla.redhat.com/show_bug.cgi?id=1483629
--- Comment #4 from Peter Rathlev peter@rathlev.dk --- I'm also on a Thinkpad, though a T530 (specifically model 24295ZG). So it's probably specific to Thinkpad.
Agree that it's not Blender. And good thing to rename the bug, but I don't think it's emulation failing. Emulation (when using left+right lower mouse buttons, those that belong to the touchpad) actually works, whereas the physical middle mouse button (upper buttons, between the spacebar and the touchpad) does not. Maybe it could be called "Middle mouse button fails on Thinpad T520/T530"?
It tested installing "xorg-x11-drv-synaptics-legacy" and that does not seem to make a difference to this problem, though the touchpad does seem to handle a bit better.
I have perused the Lenovo forum thread and it doesn't look like the same problem to me. In this case everything except the physical middle mouse button works, and the problems seems to be that the "press" event is held back until the button is released, at which point it arrives together with the "release" event. And this is seen with "xev"; testing with "evtest" from a text VTY shows events arriving as expected, "press" on button down and "release" on button up.