fix(document): synchronize before applyEdits on vim

[fannheyward]

Closes #5411

The document content didn't synchronized for unknown reason, make the synchronize manually on vim.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.96%. Comparing base (b0a699d) to head (93b57d1).

Files with missing lines	Patch %	Lines
src/model/document.ts	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5438      +/-   ##
==========================================
- Coverage   97.98%   97.96%   -0.02%     
==========================================
  Files         280      280              
  Lines       27867    27869       +2     
  Branches     5771     5772       +1     
==========================================
- Hits        27305    27303       -2     
- Misses        104      105       +1     
- Partials      458      461       +3     

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