I've released the second beta of XQuartz 2.7.10. The main changes since the previous beta include:
fixes for TCP connections
enabling of IGLX support
the stuck "h" after hiding bug
improved WM_PROTOCOLS support
fixed a buffer overrun in libXfont
various package version updates.
https://www.xquartz.org/releases/XQuartz-2.7.10_beta2.html