[Addon Storysource] Add auto scrolling to the selected story

[igor-dv]

Issue: When selecting a story, panel should be scrolled to a selected area in code

What I did

Added an auto-scrolling

[codecov]

Codecov Report

Merging #3025 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3025      +/-   ##
==========================================
- Coverage    37.3%   37.28%   -0.02%     
==========================================
  Files         435      435              
  Lines        9427     9432       +5     
  Branches      912      897      -15     
==========================================
  Hits         3517     3517              
- Misses       5345     5381      +36     
+ Partials      565      534      -31

Impacted Files	Coverage Δ
addons/storysource/src/StoryPanel.js	0% <0%> (ø)	⬆️
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-76.67%)	⬇️
.../src/modules/ui/components/stories_panel/header.js	29.62% <0%> (ø)	⬆️
lib/ui/src/modules/ui/routes.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/search_box.js	36.36% <0%> (ø)	⬆️
addons/jest/src/hoc/provideJestResult.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/addon_panel/index.js	34.78% <0%> (ø)	⬆️
addons/actions/src/lib/util/getPropertiesList.js	60% <0%> (ø)	⬆️
app/react/src/client/preview/element_check.js	67.64% <0%> (ø)	⬆️
... and 66 more

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[igor-dv]

If storysource addon will be merged to 3.3, I assume this one is also might be

[Hypnosphi]

Agree. Let's wait what @shilman says about the addon itself

[igor-dv]

@Hypnosphi , I've added a delay for 2 secs there. Is it still needed after your #3027 ?

[Hypnosphi]

No, #3027 should replace it