Fixed OpDialogue size behaviour.
Fixed OpDialogue size behaviour.

It now automatically expands if necessary when the parameters or details panes are first shown.

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