Xpra: Ticket #2504: xpra shadow "flickering"

There is some "flickering" happening on shadow functionality.

Please check the video

$ xpra version
xpra for python 2.7 is not installed
 retrying with python3
$ lsb_release -rd
Description:	Ubuntu 16.04.6 LTS
Release:	16.04


Xpra GTK3 client version 4.0-r24512 64-bit
  running on Microsoft Windows 10

It is not an issue of this version per se, and the issue is more apparent in the login screen rather than in normal screens.

It "feels" like it got excaggerated vs Xpra-Python2-x86_64_3.0.1-r24232, but it is not work-impeding

Mon, 02 Dec 2019 10:49:00 GMT - stdedos: attachment set

Mon, 02 Dec 2019 15:23:19 GMT - Antoine Martin: owner changed

I see two different pictures and some flickering, but it's not clear which picture is actually meant to be shown (desktop background?), or where the other one is from.

How do I reproduce? Just shadow the server? Something like this?:

xpra_cmd.exe shadow ssh://ubuntuuser@ubuntu1604/

Do I need to have a screensaver running? Do I click somewhere?

Mon, 02 Dec 2019 15:28:55 GMT - stdedos: owner changed

Ubuntu is configured with changing-over-time backgrounds (Settings -> Appearance -> Select Image-with-clock, no external machinery there)

I execute with:

xpra_cmd.exe shadow ssh://user@ip/--opengl=no --desktop-scaling=0.75 --min-speed=70 --webcam=no --speaker=off --microphone=off --pulseaudio=no --exit-with-client=no

I have connected to the server when it was screen-off-by-inactivity. No screensaver or sleep-by-inactivity configured.

All I did was to simply move the mouse to wake up the screens.

Sat, 15 Feb 2020 12:31:07 GMT - Antoine Martin: owner, status, milestone changed

No idea where to look for this one.

Sat, 23 Jan 2021 05:53:05 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2504