fix: 3way merge result model save error

[opensumi]

Types

• 🐛 Bug Fixes

Background or solution

由于 3way 模式中 result 视图打开的是 git 协议的文件，而在 git 插件里 git 协议的文件是只读的，导致在执行 save 事件的时候右下角提示 Method not implemented。尤其是开启了自动保存之后，导致频繁报错。

Changelog

---

Backport from #3361 a350542

Thanks to @Ricbet for your valuable contribution.

[AhkunTa]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.59%. Comparing base (a7bb17f) to head (bc80491).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3403      +/-   ##
==========================================
- Coverage   57.61%   57.59%   -0.02%     
==========================================
  Files        1427     1427              
  Lines       87840    87840              
  Branches    18100    18100              
==========================================
- Hits        50605    50595      -10     
- Misses      33869    33878       +9     
- Partials     3366     3367       +1     

Flag	Coverage Δ
jsdom	52.80% <ø> (-0.02%)	⬇️
node	16.12% <ø> (ø)

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