SUMMARY
If one opens a lot of tabs then the extra tabs get hidden and have to be scrolled to somehow. That works when you use the scroll wheel, but when you click on a tab the bar auto-scrolls to hide the overflown tabs.

For example these are the tabs open, tabs hidden due to overflow are in parenthesis:

1 2 3 4 5 6 7 (8) (9)
^

When one scrolls to see the last tab, like this:

(1) (2) 3 4 5 6 7 8 9
                    ^

Then clicking tab 8 will result in this:

(1) 2 3 4 5 6 7 8 (9) 
                ^

Instead of proper (this happens when you use the mouse wheel to scroll):

(1) (2) 3 4 5 6 7 8 9
                  ^


OBSERVED RESULT
The tab bar auto-scrolls and hides items that are after the clicked tab.


EXPECTED RESULT
The tab bar doesn't auto-scroll, that it behaves the same using a mouse click than it does when using a scroll wheel.


SOFTWARE/OS VERSIONS
Operating System: Kubuntu 20.04
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8