[xmonad] Strange Thunar CPU idling phenomenon

[Don Stewart]

semdornus:
> I'm using XFCE's filemanager Thunar and am witnessing something strange
> when using xmonad. I would like to know if this is a problem with
> xmonad, or with my system. So if anyone uses Thunar could you please
> check if this happens?
> 
> I tried this with my own config, but it happens with no config (=default
> one) as well.
> 
> Steps to reproduce:
> 
> 1. Start xmonad.
> 2. Start Thunar.
> 3. Move Thunar to a different workspace.
> 4. Observe Thunar's idling CPU state in htop or similar.
>    On my PC it is now idling at 3-7%.
> 5. Switch to workspace where Thunar now is and change Thunar to a
>    different directory.
> 6. Check CPU idling again. It is now 0% as expected.
> 
> Strange thing is that just focusing Thunar on the second workspace isn't
> enough; you have to change the directory. I have no idea what causes
> this strange behavior. I tried other (tiling) window managers and they
> all start idling Thunar at 0% as expected.
> 
> Anybody have an insight?

Hmm. Very interesting. The app must be polling for something, or
spinning. Maybe it doesn't like being unmapped.

-- Don