Comment # 6 on bug 1043266 from Fabian Vogt

(In reply to Fred Brubine from comment #5)
> My installation is completely broken without that fix.  As the referenced
> bug report shows, the taskbar is unusable for selecting app instances when
> more than  10-15 or so instances are present, and I often have more emacs
> than that open.
> 
> If this isn't fixed, I think I'll have to leave OpenSUSE because I can't
> work with such a broken setup.

You can use external repositories such as KDE:Frameworks5:LTS with Plasma
5.8.7.

> This problem was INTRODUCED by the previous KDE 5 update, but now it's not
> going to be fixed?

Which one? The change can be reverted.