Noise Reduction Preview button remains grayed-out for Step 2

[petersampsonaudacity]

Bug description

Noise Reduction Preview button remains grayed-out for Step 2 .

It is properly grayed out for Step 1, but once you have a noise profile captures the the next invoking of Noise Reduction the NR should be ready to apply and the Preview button should be available and not grayed-out.

This is a regression on 3.1.3

The Preview is important before applying the effect so I believe this warrants at least P2 rating

Steps to reproduce

1. get some audio
2. select a portion for Noise Profile capture - Step 1
3. Edit > Noise Reduction
4. Observe: Preview button is grayed-out and unavailable - expected behavior
5. Press OK to capture the Noise profile
6. Select the whole project
7. Edit > Noise Reduction
8. Observe: Preview button remains grayed-out and unavailable

Expected behavior

The Preview should be available once Audacity has captured a Noise Profile.

Remember that once a Noise Profile is captured Audacity retains that until you close Audacity.

Actual behavior

Step 1

Step 2

Audacity Version

current master / alpha / nightly build audacity-win-3.2.0-alpha-20220902+7c9c978-x64-msvc2022

Operating system

Windows - but suspect all OS

Additional context

See: Noise reduction effect can crash Audacity #3525

[Paul-Licameli]

I think the fix for #3525 fixed this too.

You did not have that fix yet, if you were given the OK button in step 1 of noise reduction. Unknown why you didn't get a crash when you pressed it then.

[LWinterberg]

looks fixed to me

[Ryan-Miller-Audacity]

Tested and verified fixed in latest Alpha branch.