WRQ-9536: Fix scrolling by wheel to scroll smoothly

[vJIYEv]

Checklist

• I have read and understand the contribution guide
• A CHANGELOG entry is included
• At least one test case is included for this feature or bug fix
• Documentation was added or is not needed
• This is an API breaking change

Issue Resolved / Feature Added

Scroller and VirtualList should show smooth scrolling by wheel with animation but I found scrolling by wheel shows not smooth like before.

Resolution

In scroll handler function, we have code to scroll smoothly with animation.
It runs when delta value is not 0 but default delta is 0 now in native wheel handler.
So I set default delta value to show animation.
Default delta value is came from calculated delta of the case when event target is out of scroll content.

Additional Considerations

Links

WRQ-9536

Comments

Enact-DCO-1.0-Signed-off-by: Jiye Kim (jiye.kim@lge.com)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.59%. Comparing base (81358d5) to head (0936d35).

Files	Patch %	Lines
useScroll/useEvent.js	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1611      +/-   ##
===========================================
- Coverage    81.60%   81.59%   -0.02%     
===========================================
  Files          148      148              
  Lines         6676     6677       +1     
  Branches      1986     1986              
===========================================
  Hits          5448     5448              
- Misses         935      936       +1     
  Partials       293      293              

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