#6923 develops the Camera Raw dialog's preview on the GPU whenever no spatial stage is set,
from `per_pixel`'s stages. #5128 adds Calibration (primaries and Shadows tint) to the CPU
develop between white balance and Dehaze, which those stages don't run, so with both merged
a Calibration-only change previewed unchanged on the GPU while Open applied it. `per_pixel`
now returns None when Calibration is set, so the dialog develops on the CPU then. The
white and black points stay as they were, so the dialog's points cache is still right once
Calibration goes back to neutral. The hardware parity doc and BUG-204-3's note now say so.
Co-authored-by: Fabio Lissi <3223836+FabioLissi@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>