Bug#798807: plasma-workspace: 100% CPU usage when starting (may be because of activities)

[Zhang Jingqiang <zh_jq@outlook.com>]

> Package: plasma-workspace
> Version: 4:5.4.1-1
> Severity: important
> 
> Dear Maintainer,
> 
> plasmashell crashed when I'm using the non-default activity,
> then start plasmashell at yakuake didn't work as it use 100% CPU
> and don't respond.
> reboot does not help either.
>
/usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/main.qml:231:5: 
QML TaskList: Binding loop detected for property "rows"