40ba8c19cf
- Added cursor remapping support to deferredMutation intents and emitted cursor positions when deferring offscreen mutations. - Introduced planDeferredShrink to defer bottom-anchored offscreen deletions only when displayed rows were byte-identical, otherwise repainted the viewport. - Added regression tests covering unknown-win32 offscreen middle-shrink behavior, including cursor-only moves and tail-content-change cases.