How do I get VMware Fusion to use the native screen resolution within a scaled OSX desktop?
From here:


Install the VMware Tools by selecting Virtual Machine → Install VMware Tools in the menubar. Follow the on-screen instructions.
Set Use full resolution for Retina display in VMware Fusion’s Settings → Display preferences panel.
Run this command in Terminal on your OS X guest VM and enter your password when requested: sudo defaults write /Library/Preferences/com.apple.windowserver.plist DisplayResolutionEnabled -bool true
Log out of your OS X guest VM and then re-login.
Resize your OS X guest VM window to your preferred dimensions.
In System Preferences → Displays, set the resolution to Scaled and then select the HiDPI setting.


Note: If you resize your guest VM, it will revert to the non-HiDPI resolution. Simply re-select the HiDPI resolution in the System Preferences → Displays preferences panel.