Fixed Dialogue positioning and focussing on Linux.
Fixed Dialogue positioning and focussing on Linux.

Fixes #220. Fixes #642. I suspect this could also sort out #62, but that needs to be verified by a KDE user.

chippey/gaffer,andrewkaufman/gaffer,boberfly/gaffer,appleseedhq/gaffer,goddardl/gaffer,ivanimanishi/gaffer,cedriclaunay/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer,ImageEngine/gaffer,hradec/gaffer,chippey/gaffer,lucienfostier/gaffer,chippey/gaffer,davidsminor/gaffer,GafferHQ/gaffer,hradec/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,boberfly/gaffer,cedriclaunay/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,davidsminor/gaffer,boberfly/gaffer,lucienfostier/gaffer,goddardl/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,boberfly/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,ivanimanishi/gaffer,appleseedhq/gaffer,davidsminor/gaffer,goddardl/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,davidsminor/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,hradec/gaffer,hradec/gaffer,hradec/gaffer,GafferHQ/gaffer,chippey/gaffer,ImageEngine/gaffer,cedriclaunay/gaffer,goddardl/gaffer