Why do frozen applications disappear from the Linux window manager

[James-Oakley]

I'm sure this must be a FreeRDP issue, rather than winapps per se, but I can't find anything about it

Let's say I have multiple Windows apps open on my desktop (Fedora, KDE Plasma). If one of those applications needs to run something CPU intensive that means it's screen output doesn't update for more than 5-10 seconds, the window disappears from my Linux desktop. For example, you might have a spreadsheet in Excel that contains some complex calculations; on hitting Recalc within Excel, it takes 10 seconds to recalculate the values, but then that Excel window just vanishes. The other windows remain as they were.

The application remains running in the RDP session. If I open a new winapps app, you get the usual thing you get when launching an additional one - all the winapps windows disappear for a few seconds, before all reappearing with the new window there as well. If there was a Windows application that has vanished from the Linux desktop, it comes back with the others at this point. So my work-around is to have a very simple batch file on the Windows computer that just sleeps for a couple of seconds before exiting - I can call that from a .desktop shortcut on my Linux PC and it will bring any hidden applications back in play.

My question is: Why do dormant / busy windows vanish? Is there some setting (keep-alive, timeout, other) that can be adjusted to prevent this happening? Has anyone else found a more elegant work-around than mine?

[James-Oakley]

It turns out this is only an issue if the Windows application window is running maximised. If I restore the window size to a manual size that is less than the full desktop, the window no longer vanishes if the Windows application stops responding for a few seconds.