fix(model): fire onTextChange on TextChangedI

[fannheyward]

This fixes issue like #4873 on Vim, but

coc.nvim/src/model/document.ts

Lines 648 to 655 in 392264f

	let { line, changedtick, lnum } = change
	if (changedtick === this.changedtick) return
	let newLines = this.lines.slice()
	newLines[lnum - 1] = line
	this.lines = newLines
	fireLinesChanged(this.bufnr)
	this._changedtick = changedtick
	if (event !== 'TextChangedP') this._forceSync()

won't called anymore.

I've checked 930c6dc, but still can't get the original logic, needs more tests.

Before this change, vim couldn't get correct lines of buffer as nvim.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.58%. Comparing base (00bd79e) to head (ac5516a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4875   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files         273      273           
  Lines       26075    26075           
  Branches     5391     5391           
=======================================
  Hits        25705    25705           
+ Misses        217      216    -1     
- Partials      153      154    +1     

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