I have been playing with COSMIC lately. One feature that COSMIC has that I would like to see on KDE Plasma is Active Window Hint
In the above screenshot, there are four Apps in floating windows that overlap each other in the middle. All four windows have sufficient screen area exposed that you can click on any window to activate it. With Active Window Hint the active window is easily identified with the CYAN colored outline of the window.
Is there a way to do this in Plasma?
Pudge
Is this feature applied to all themes, or just the default one?
I assume you are talking about COSMIC DE.
In Settings – Desktop – Appearance – Window Management there is the following option
Acrive window hint size. I assume the 3 is pixels. If you set it to 0 the Active window hint goes away. In the above image, Active Window Hint size is set to 3.
COSMIC is basically GNOME written in Rust. I haven’t messed with Gnome for quite some time. but I think COSMIC is much better with giving the user more options than GNOME does.
And yes, that is Dolphin, Kate, and Gnome-disk-utility in the image with COSMIC settings app in the lower left. So basically I have COSMIC PLASMA because I can’t give up my Kate and Dolphin.
Pudge
My first impressions are good as well, although I can’t stand GNOME so my bar is set pretty low. The v1.0 version is supposed to be out next month, correct? I don’t think it’s going to be ready. I’m still seeing bugs from the first alpha release that haven’t been fixed (always have to click the Applications menu twice to get the window to open).
I did find a few links regarding setting different border options for active/inactive windows in KDE, but they all were referencing KDE 4.x.
If I’m not mistaken, this is achievable in KDE Plasma by using Klassy. I saw @Noodly or @UncleSpellbinder shared the screenshots with this feature. Maybe they can provide some input.
We are about to leave and go to our daughters house for Thanksgiving.
I will have to look into this when we get back home.
Pudge
Happy Thanksgiving 
