static FOCUS_RESTORE_WNDPROCS: LazyLock<Mutex<HashMap<usize, isize>>>Expand description
Map of top-level HWND -> original WndProc for the focus-restore subclass
installed by install_top_level_focus_restore_hook. Kept separate from
ORIGINAL_WNDPROCS so the two hooks can coexist on the same HWND in
either order (the focus-restore hook always passes through to its own
recorded original, which transitively walks back through any other hook).