This seems to also fix a problem I have been having with the XFCE window manager in Slackware --- any change from the default size of 800X600 resulted in "hash" lines on the bottom half of the screen and a cursor that decided to wander on its own.
Setting GL for rendering fixed it (and it runs cooler!!).
MacBook Pro 2015 - current Slackware, VMware 11.0.2
It appears that Apple's Metal and VMWare Fusion don't play quite right yet. OpenGL is fine for me.