Function is_node_locked 

pub fn is_node_locked(node: &LayoutNode) -> bool

A minimize-locked node: a minimized leaf (minimizedSize), a slipped header (slipMinimize), or a dissolved column (columnDissolve). The fields are written by the frontend minimize subsystem and round-trip through the untyped extra catch-all on this side. Mirrors isNodeLocked in frontend/layout/lib/layoutMinimize.ts.