[winswitch] Popup not shown

[Antoine Martin]

On 12/12/2019 21:58, Wolfram Humann via shifter-users wrote:
> Hi,
> (server: xpra 3.0.3 on RHEL, client: xpra 3.0.3 on Win10)
> I have a Java/Swing/Batik based tool that controls some electronic
> hardware. When I click on certain components, a popup window should appear
> -- but it does not. I noticed that behavior before updating xpra to 3.0.3
> (some 3.0.1 or 3.0.2 versions) and hoped the update might fix it, but it
> doesn't.
Is this a regression?
Did it used to work with older versions like 2.5.x or even 1.x?
> The popup does not appear when it should but an icon on the windows taskbar
> appears, indicating that there should be a popup. I minimized all windows
> to make sure that the popup is not hidden behind one of them.
Maybe it got mapped off-screen?
I may have seen a bug similar to what you describe.

> The popup appears when I use cygwin/xwin connection to the RHEL workstation
> instead of xpra.
Can I reproduce the problem myself with an app? This one or even another
one?
> Any idea?
If I can't reproduce the problem, it will be harder to fix.
You can try creating a ticket with the client's "-d window" log output
of when the window is meant to show up, this may give us a clue.> (as a
sidenote, the main-window of the tool sometimes [not always] is just
> black when started. This can be fixed by slightly resizing the tool's
> window)
Sounds like window paint race condition:
* turning OpenGL off might fix things, at the cost of performance
* "refresh windows" from the tray menu will probably paint it properly
* "re-initialize windows" from the tray menu, should fix it too

Can I reproduce this problem on my systems somehow?

Cheers,
Antoine