Fix #6077: issue with selectedPanel reset

[malykhinvi]

Issue: #6077

What I did

Added check for options.selectedPanel presence, so that if it is undefined it won't reset the currently selected panel.

How to test

• Is this testable with Jest or Chromatic screenshots? Yes, I added unit tests
• Does this need a new example in the kitchen sink apps? No
• Does this need an update to the documentation? No

[codecov]

Codecov Report

Merging #6149 into next will increase coverage by 0.38%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##            next    #6149      +/-   ##
=========================================
+ Coverage   37.9%   38.29%   +0.38%     
=========================================
  Files        645      643       -2     
  Lines       9642     9420     -222     
  Branches     354     1344     +990     
=========================================
- Hits        3655     3607      -48     
+ Misses      5940     5254     -686     
- Partials      47      559     +512

Impacted Files	Coverage Δ
lib/ui/src/core/layout.js	51.51% <100%> (ø)
lib/ui/src/settings/shortcuts_page.js	0% <0%> (-25%)	⬇️
lib/ui/src/containers/panel.js	14.28% <0%> (-19.05%)	⬇️
lib/ui/src/containers/nav.js	11.76% <0%> (-4.91%)	⬇️
addons/notes/src/Panel.tsx	39.62% <0%> (-4.28%)	⬇️
app/angular/src/client/preview/angular/helpers.ts	38.63% <0%> (-0.14%)	⬇️
app/polymer/src/client/index.js	0% <0%> (ø)	⬆️
app/html/standalone.js	0% <0%> (ø)	⬆️
lib/core/src/server/config.js	0% <0%> (ø)	⬆️
lib/core/src/server/cli/prod.js	0% <0%> (ø)	⬆️
... and 231 more

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[shilman]

LGTM and great job on the test cases 👌 Thanks so much for taking care of this!

[malykhinvi]

I see a conflict, looks like layout.js has been moved to lib/api/src/modules/layout.ts, but test is left untouched. Do you want me to resolve conflicts?

[shilman]

@malykhinvi yes please! 🙏

[malykhinvi]

@shilman done!