Controls panel does not refresh properly

[priandsf]

Describe the bug
The controls panel (from addon-controls) does not proper refresh when selecting a different story on the same component.

To Reproduce
Steps to reproduce the behavior:
1 Go to https://lwc-essentials.github.io/storybook/lwc-library/?path=/story/units-1-attributes--default-with-args
2 Add some test to attrString (ex' ABCDEF'). You see the JSON dump being updated
3 Select the next story ('Default With Spread Args'). The attrString in the control panel still hold the previous value but the current component does not consume it. Add one character, 'G', at the end of edited value to make 'ABCDEFG'. Now the component picks up the whole value
4 When you switch back between the 2 stories, it looks like they no have their own values.

Expected behavior
on Step 3, the panel should should empty values

Screenshots
N/A

Code snippets
N/A

System:
"@storybook/core": "6.0.0-rc.8",
System:
OS: macOS 10.15.5
CPU: (16) x64 Intel(R) Xeon(R) CPU E5-1680 v2 @ 3.00GHz
Binaries:
Node: 12.18.2 - ~/.nvm/versions/node/v12.18.2/bin/node
Yarn: 1.22.4 - ~/.nvm/versions/node/v12.18.2/bin/yarn
npm: 6.14.5 - ~/.nvm/versions/node/v12.18.2/bin/npm
Browsers:
Safari: 13.1.1

Additional context
N/A

[tmeasday]

@shilman I think this is likely just a problem with undefined coming down the line into your stateful control component.

I added a repro in the branch 11586-fix-args-refresh:

https://www.loom.com/share/c195dee7689040b7bb5d0edae88d443f

[shilman]

Yee-haw!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.0.0-rc.12 containing PR #11619 that references this issue. Upgrade today to try it out!

You can find this prerelease on the @next NPM tag.

Closing this issue. Please re-open if you think there's still more to do.

[priandsf]

Thanks, first quick tests show it working properly!