Not sure when or why.
glxgears stutters or just stops updating completely. glxspheres doesn't even start.
Bisecting:
The correct fix is r22456. But for v2.5.x, I'm going to backport r22457 instead as that's less likely to cause regressions somewhere else.
Backport in r22458.
Although the fix is server-side, there is a workaround we can apply to the client side: r22471, backport in r22472. This allows for a smaller bug fix release: only the html5 package needs updating.
Pushed the html5 client update. With one caveat: for some reason, the fedora 29+ builds for 2.5.x are now failing the unit tests - on the buildbot only, so I had to turn them off - which means that the version string contains an "M" (modified): 2.5.1-0.r22473M
.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2251