feat(completion): support textEditText

[fannheyward]

Closes fannheyward/coc-xml#519

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.35%. Comparing base (baac60a) to head (cc2a988).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/completion/source-language.ts	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5253      +/-   ##
==========================================
+ Coverage   97.32%   97.35%   +0.02%     
==========================================
  Files         291      291              
  Lines       27040    27040              
  Branches     5611     5611              
==========================================
+ Hits        26318    26326       +8     
+ Misses        502      497       -5     
+ Partials      220      217       -3     

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[iselind]

Is there a release plan for this change?

[fannheyward]

@iselind this change has been published to the release branch.