Constant NCPLANE_OPTION_FIXED 

pub const NCPLANE_OPTION_FIXED: NcPlaneFlag_u64 = _; // 8u64

NcPlaneFlag_u64 flag to avoid scrolling alongside its parent.

If this plane is bound to a scrolling plane, it ought not scroll along with the parent (it will still move with the parent, maintaining its relative position, if the parent is moved to a new location).