ccls diagnostics can't disappear in some case

[fcying]

Describe the bug

after I fix error, diagnostics can't disappear.

Environment

• neovim/vim version (nvim --version or vim --version):vim 8.1 1-1750
• This plugin version (git rev-parse --short HEAD):e4478a4
• This plugin's binary version (bin/languageclient --version):0.1.147
• Minimal vimrc content (A minimal vimrc is the smallest vimrc that could reproduce the issue. Refer to an example [here][min-vimrc.vim]):

test_vimrc

set nocompatible
set encoding=utf-8
set runtimepath+=~/.vim/plugged/ncm2
set runtimepath+=~/.vim/plugged/vim-hug-neovim-rpc
set runtimepath+=~/.vim/plugged/LanguageClient-neovim
set hidden
set number
set laststatus=2

inoremap {<CR> {}<ESC>i<CR><c-o><s-o> 

let g:LanguageClient_serverCommands = {
      \ 'c': ['ccls'],
      \ 'cpp': ['ccls'],
      \ }
filetype plugin indent on
syntax enable

To Reproduce

Steps to reproduce the behavior:

1. vim -u ~/test_vimrc main.c
2. insert: if (rc == ) { , click<CR>
3. save file
4. fix error: if (rc == 0), save
5. diagnostics can't disappear

Screenshots

If applicable, add screenshots to help explain your problem.

[autozimu]

Is this still reproducible?

I'm not able to reproduce it locally with

• neovim: 0.3.8
• ccls: stable 0.20190314.1

[autozimu]

No longer reproducible and no response during 7 days.

[fcying]

@autozimu reproducible with vim 8.1 Included patches: 1-1950. Tested 5 times reproduce once

$ccls --version
ccls version <unknown> (install from brew)
clang version 8.0.0 (tags/RELEASE_800/final)

LanguageClient-neovim ‹next›$git rev-parse --short HEAD
baea090

LanguageClient-neovim ‹next›$bin/languageclient --version
languageclient 0.1.147