code: def _process_backend_kwargs(self, kwargs):
          
          # Verify given argument with capability of the backend
          app = self._vispy_canvas.app
          capability = app.backend_module.capability
          if kwargs['context'].shared.name:  # name already assigned: shared
              if not capability['context']:
                  raise RuntimeError('Cannot share context with this backend')
          for key in [key for (key, val) in capability.items() if not val]:
              if key in ['context', 'multi_window', 'scroll']:
                  continue
              invert = key in ['resizable', 'decorate']
              if bool(kwargs[key]) - invert:
                  raise RuntimeError('Config %s is not supported by backend %s'
                                     % (key, app.backend_name))
  
          # Return items in sequence
          out = SimpleBunch()
          keys = ['title', 'size', 'position', 'show', 'vsync', 'resizable',
                  'decorate', 'fullscreen', 'parent', 'context', 'always_on_top',
                  ]
          for key in keys:
              out[key] = kwargs[key]
          return out
docs: Simple utility to retrieve kwargs in predetermined order.
          Also checks whether the values of the backend arguments do not
          violate the backend capabilities.