fixed infinite render loop

[kazupon]

Issue: #1747

What I did

fixed the issue

How to test

check the below URL repo
https://github.com/mattrothenberg/storybook-test

[codecov]

Codecov Report

Merging #2100 into master will increase coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #2100      +/-   ##
==========================================
+ Coverage    21.4%   21.41%   +<.01%     
==========================================
  Files         263      263              
  Lines        5793     5796       +3     
  Branches      695      695              
==========================================
+ Hits         1240     1241       +1     
- Misses       4015     4016       +1     
- Partials      538      539       +1

Impacted Files	Coverage Δ
addons/knobs/src/vue/index.js	30.43% <50%> (+0.43%)	⬆️
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
addons/info/src/components/Props.js	36.36% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/left_panel/header.js	29.62% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	50.47% <0%> (ø)	⬆️
addons/knobs/src/components/types/Color.js	8.1% <0%> (ø)	⬆️
...ponents/left_panel/stories_tree/tree_decorators.js	33.33% <0%> (ø)	⬆️
addons/knobs/src/KnobStore.js	9.09% <0%> (ø)	⬆️
... and 17 more

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[Hypnosphi]

Please don't use "closes" and "fixes" magic words, we close the issues only after release. When a PR gets merged, we simply mark the issue with merged label: https://github.com/storybooks/storybook/blob/master/CONTRIBUTING.md#closing-issues

[kazupon]

sorry, I'll be more careful 🙇

[ndelangen]

Please don't use "closes" and "fixes" magic words, we close the issues only after release. When a PR gets merged, we simply mark the issue with merged label: https://github.com/storybooks/storybook/blob/master/CONTRIBUTING.md#closing-issues

Something to discuss on the Roadmap meeting.