Function replay 

pub fn replay(
    list: &DisplayList,
    store: &GrobStore,
    renderer: &mut dyn GridRenderer,
)

Replay a display list through a renderer, resolving all units to device cm.

This walks the display list items in order:

• PushViewport pushes a viewport and optionally clips
• PopViewport pops and unclips
• Draw resolves the grob’s units against the current viewport transform and calls the appropriate renderer method