Hello!
1: Open your app of choice, open 20 tabs.
2: Hover your mouse over the taskbar app icon to reveal the open windows.
- Notice how you cannot access most of them since your screen has finite real estate space.
My first move was to use the mouse to scroll them but it did not work. Second move was click and drag like you would do on a touch screen but it did not work, third move was to use the arrow keys and they did not work either.
Since none of these do anything else in that scenario, it would be kinda cool to have in a future version of KDE :).
Thank you for your attention!