What is the crowd's opinion of KWin?

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Use the KWin window rules, Active/Inactive opacity

https://userbase.kde.org/KWin_Rules_Window_Attributes#Window_Attributes

Yes, but you need a compositor that will take care of what your windows look like and behave. There is probably a lot that you can change about the configuration of kwin.

Here is an example of what kwin does and its configuration.

This is the KDE "wiki" page were they talk a lot of how to do something and troubleshoot.

Thanks, I've been having a look at the documentation but can't make heads nor tails of it. :/

They seem to be quite out of date.

https://userbase.kde.org/KWin_Rules

Kinda. It was just an example. KDE has a lot of that stuff built in, too, I think.

https://docs.kde.org/trunk5/en/kde-workspace/kcontrol/kwintabbox/index.html#visualization

"Flip switch" sounds a lot like what he wants: https://userbase.kde.org/KWin/Gallery

This is what I was looking for. Thank you so much!!!

I had found wmiface referenced on https://userbase.kde.org/KWin#Script_the_window_manager_from_the_command_line, which looked like what I needed, but it's not available in the arch repos.

I had also looked into writing a kwinscript for this, but the docs at https://techbase.kde.org/Development/Tutorials/KWin/Scripting left a little to be desired and I couldn't get workspace.clientList() to even recognize that konsole was running.

This works, thank you so much!!