I think this is a big accessibility issue. Please let tabs be tabs. This design seems too similar to Firefox's new design where it's hard to tell which tab is active (specially if you have only two open). I feel like tabs should be attached to the viewport/content otherwise they look like buttons where my intuition is to click on an active to tab to activate it
Consider having just two of them. The one which is active actually seems like a button that demands attention. It's basic design stuff. Tabs denote choices between active viewports, it should be unambiguous always which one is active. These hovering tabs are more like buttons which intuitively ask to be clicked
Try looking at the comparison screenshots in this repo. Or look up some images of firefox australis. You'll see how tabs are actually behaving like tabs and are denoting clearly which one is active by linking itself naturally to the viewport
Because the programming language I actually know is python, in c++ I'm currently barely above the „hello world”-level. It also annoys me, but at the moment I haven't yet figured a way out to align it properly, as soon as I do, I'll promise that I will align it
I like the before more. I would also like the color of the active tab to be the same as the area’s backgroud it’s connected to, like in Linux Mint’s default theme.
Lightly half works for me on Plasma 6 following instructions on the qt6 version on GitHub. The window decorations and Lightly-related aspects of the plasma theme work, but I can't apply the application style.