Remove the dockwidget titlebar proxy style again.
This exposes an issue in Qt, where apparently if there's a proxy
style set for the titlebar widgets, the dockers become part of the
central widget, and get the central widget's cursor changes.
And that breaks the layerbox; the cursor follows the canvas cursor,
which is unusable :-(
CCMAIL:kimageshop@kde.org
CCMAIL:scott.petrovic@gmail.com