Comment # 1 on bug 944656 from Wolfgang Bauer

(In reply to Franklin Titus from comment #0)
> A couple Tumbleweed packages are producing file conflict during
> installation. The following message was observed after running 'zypper up'
> and the installation process began:
> 
> File /usr/lib64/qt5/plugins/kded_desktopnotifier.so
>   from install of
>      plasma5-workspace-5.4.0-1.1.x86_64(repo-oss)
>   conflicts with file from package
>      kio-extras5-5.3.2-1.1.x86_64(@System)

This happens with "zypper up"?

kio-extras5 should be updated too, the current version in Tumbleweed is 15.08.0
which should not have a file conflict with plasma-workspace-5.4.0.

What happens when you manually run "zypper up kio-extras5"?