fix(module:splitter): ensure panels sum to 100% after resize

[keke521jie]

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• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
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• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Issue Number: close #9276

Does this PR introduce a breaking change?

• Yes
• No

Other information

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.39%. Comparing base (b0a4287) to head (66e386d).
⚠️ Report is 62 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9429      +/-   ##
==========================================
- Coverage   92.12%   91.39%   -0.74%     
==========================================
  Files         561      561              
  Lines       19631    19738     +107     
  Branches     3107     3033      -74     
==========================================
- Hits        18086    18039      -47     
- Misses       1206     1371     +165     
+ Partials      339      328      -11     

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[Laffery]

这个改动是出于什么？按照当前设计，innerSizes 是保存实际像素大小的

  /**
   * Derived from defaultSize of each panel.
   * After that it will be updated by the resize event with **real** size in pixels.
   */

[keke521jie]

现在的实现在拖动调整大小后手动缩小放大屏幕会出现

这种情况。innerSizes的像素值没有计算对导致sizes百分比计算错误

所以改成了百分比计算