html5 broadway h264 decoder stopped working

[Antoine Martin]

Not sure when or why.

glxgears stutters or just stops updating completely.
glxspheres doesn't even start.

[Antoine Martin]

Bisecting:

• v2.5.x BAD
• v2.4.x OK
• r22132 BAD
• r21133 OK
• r21632 OK
• r21882 OK
• r22007 OK
• r22070 BAD
• r22038 BAD
• r22022 OK
• r22030 OK
• r22034 OK
• r22036 OK
• r22037 BAD

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.

[Antoine Martin]

Backport in r22458.

[Antoine Martin]

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.

[Antoine Martin]

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.

[migration script]

this ticket has been moved to: ​https://github.com/Xpra-org/xpra/issues/2251