OpenGLQt: Fix for loading hidden canvas
OpenGLQt: Fix for loading hidden canvas

inviwo/inviwo,Sparkier/inviwo,Sparkier/inviwo,inviwo/inviwo,Sparkier/inviwo,inviwo/inviwo,inviwo/inviwo,inviwo/inviwo,inviwo/inviwo,Sparkier/inviwo,Sparkier/inviwo