Fix Completion Blocked by incomplete Item

[hexh250786313]

Should fix #5028.

This pull request is still under testing.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 98.51%. Comparing base (ba3c0a9) to head (7adbccb).

Files	Patch %	Lines
src/completion/pum.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5029      +/-   ##
==========================================
- Coverage   98.51%   98.51%   -0.01%     
==========================================
  Files         273      273              
  Lines       26072    26068       -4     
  Branches     5389     5388       -1     
==========================================
- Hits        25684    25680       -4     
+ Misses        228      226       -2     
- Partials      160      162       +2     

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[hexh250786313]

coc.nvim/src/completion/pum.ts

Lines 175 to 177 in 7adbccb

	if (!noselect) {
	selectedIndex = selectedIndex == -1 ? 0 : selectedIndex
	} else {

It defaults to setting the first item as the selected state. For incompletion items with high priority values, they become the top item every time after refresh, causing them to be selected by default even if preselect is not configured. I must say, this behavior is a bit annoying. Need to fix.