UX issue: hard to tell which window is focused in materia-dark

[ptandler]

Reporter Info

• Materia version: Materia-dark-compact, commit af63425f9bbb2ac9bc4853a4357457d743c65308 / master / Thu Dec 2 13:15:58 2021 -0300
• GTK3 version: 3.24.20
• Distribution (and version): Mint 20.2
• Desktop environment (and version): Cinnamon 5.0.7
• Related application (and version): Thunderbird 78.14.0

Actual Issue

For me, it's quite hard to tell which window has the focus in Materia-dark, so it happened a couple of times that I did start typing and the input went to the wrong window.

Additional Info

One idea might be to color the window's icons. And / or choose a color for focused windows that differ significantly.

[rcdeoliveira]

I also think the dark theme has some issues, I don't know if this is related with the current theme, but it would be great to have instead a window "shadow" something like a halo on dark themes