3 showstopper bugs for 4.7 release

[Vitor Boschi]

>
> * taskbar screw ups: after opening and closing many windows, there are
> empty
> spots in the taskbar, so probably something dangling from libtaskmanager
>
>  This one is not a regression, but a long standing bug [1]. I still
experience this on 4.6.3, but couldn't figure how to reliably reproduce it.

[1] https://bugs.kde.org/show_bug.cgi?id=224447

Vitor
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