Recent versions of fontconfig give a warning with the current configuration:
Fontconfig warning: line 146: blank doesn't take any effect anymore. please remove it from your fonts.conf
Are there plans for a new release with an upgraded fontconfig?
2.12.1 was just released 3 weeks ago. The version included was the newest at the time of the release (2.11.1). fontconfig will be updated in the next release of Xquartz.
XQuartz-2.7.10_rc2 has 2.12.1
Awesome this solves the problem. Will XQuartz 2.7.10 be final around the date of macOS 10.12 release (next week)?
Not likely. I want to give it a good amount of time for people to give feedback on the libXt / Motif resolution.