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Gorgious56
ff4c642db1
Ctrl+Z / Ctrl+Shift+Z on an in-progress parametric draft (wall / stair / roof) used to leave the preview mesh frozen in its pre-undo shape — the IFC mutation rolls back but the bmesh built from draft props doesn't repaint. Add a registry of per-type regenerator functions (``UNDO_REGENERATORS``) that re-build each type's preview mesh from its current props. The dispatcher ``resync_parametric_drafts_after_undo`` walks all objects, skips any without an active parametric edit, looks up the regenerator by feature name, and calls it. Tagged 3D viewports for redraw. Types without an entry (door / window / railing / etc.) are intentionally absent — they're IFC-derived, so the undo's representation rollback + next-frame refresh already repaints correctly without a draft-side regenerator. Undo/redo wiring is self-installed by ``bonsai.bim.parametric_lifecycle``: a ``@persistent`` ``_resync_on_undo`` callback dispatches into the registry, and ``install_parametric_lifecycle_handlers()`` / ``uninstall_parametric_lifecycle_handlers()`` append/remove it from ``bpy.app.handlers.undo_post`` and ``redo_post``. ``bim/__init__.py``'s ``register()`` calls the install function *after* the central ``handler.undo_post`` / ``redo_post`` appends so the regenerators see restored IFC state — ``bpy.app.handlers`` fire in append order. ``handler.py`` itself stays ignorant of the parametric subsystem. The lazy function-local imports in each regenerator break the addon-load cycle — ``bonsai.bim.parametric_lifecycle`` loads before ``bim/module/model/*``. Generated with the assistance of an AI coding tool.