If nonzero, components of the fixed size attribute override any values
computed by a layout generator associated with this widget. Note that
just setting the fixed size alone is not enough to actually change its
size; this is done with a call to nanogui.widget.Widget.size or a call to nanogui.widget.Widget.performLayout
in the parent widget.
Set the fixed size of this widget
If nonzero, components of the fixed size attribute override any values computed by a layout generator associated with this widget. Note that just setting the fixed size alone is not enough to actually change its size; this is done with a call to nanogui.widget.Widget.size or a call to nanogui.widget.Widget.performLayout in the parent widget.