Merge a set of changes which run the OpenGL video updates in a separate v2.15.40
authorCarl Hetherington <cth@carlh.net>
Wed, 8 Jan 2020 21:22:01 +0000 (22:22 +0100)
committerCarl Hetherington <cth@carlh.net>
Wed, 8 Jan 2020 21:22:01 +0000 (22:22 +0100)
thread, hopefully making things more elegant and robust.


Trivial merge