render.settings.set saves validated named render setups (camera, output size, exposure, environment) as one undo step, and render.settings.get reads them back without applying a camera. When validated render settings are the only change, the engine keeps the evaluated model instead of rebuilding it. Setups are saved under design format 21; format-20 designs read as having none. Fixes#658; refs #620.
Contributed by @0xlillith.
Co-authored-by: lillith <[email protected]>
selune
289b521a65