Qt5 no longer provide window-system information
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
In Qt5, the Q_WS_X11 (and similar) preprocessor definitions are no longer provided, nor is QX11Info.
This causes much of the GLX initialization to be skipped in QVTKWidget, including the configuration of a visual that respects the requested multisampling, alpha planes, stencil buffer, etc.
This means that any build against Qt5 will not provide these features, leading to the broke MSAA report on the mailing list and bugs like http://www.vtk.org/Bug/view.php?id=14630. A rework of QVTKWidget to no longer rely on the Qt4 convenience API is needed to address this issue.