Coc.nvim: dart language server

[wwwdata]

Describe the bug
I configured a custom language server for dart. It is starting up and displaying some auto completions. However it is just displaying auto completions when I type in a new line, not after i have some variable/instance and want to see methods. Then it does not recommend me anything. It seems that it is just auto completing global stuff.

To Reproduce
Configured the dart_language_server like this:

{
  "languageserver": {
    "dart": {
      "command": "dart_language_server",
      "args": [],
      "filetypes": ["dart"],
      "cwd": "./lib",
      "initializationOptions": {},
      "settings": {
        "dart": {
          "validation": {},
          "completion": {}
        }
      }
    }
  }
}

Expected behavior
I get some completion suggestions for instance variables as well like with LanguageClient-Neovim

Screenshots
Here you see it completes global stuff

However, it does not find methods of a class instance like it should:

Desktop (please complete the following information):

• Terminal: [e.g. iTerm2]
• Version: [e.g. v3.2.2]
  
  
  
  • Neovim 0.3.1
  
  

[chemzqm]

Looks like the server need sometime to build the cache for completion, it works well after the server get started for a while.

I think this is unnecessary:

cwd": "./lib",

[wwwdata]

Hm, also after waiting a while it doesn't work for me. On the contrary, yes it seems to display completions after I type in the DOT so for example variable. and then I get other global completions and not completions of methods for the instance variable i am currently using.

[wwwdata]

Example: lots of global namespace stuff again and not completions for context

[chemzqm]

I have increase the timeout for content sync, hope that could solve your issue.
You have to build from source right now it see the result.

[wwwdata]

no doesn't work for me, I still see a lot of global results. I am currently using vim-lsc which works just fine with the dart_language_server

[chemzqm]

@wwwdata I've figured it out, is's bug of dart language server, it claimed to support increment document sync, but it's buggy. vim-lsp could work because it doesn't support increment sync.

https://github.com/natebosch/dart_language_server/issues/50

[chemzqm]

Or add "forceFullSync": true to configuration section of dart languageserver.

[wwwdata]

thx, that forceFullSync was fixing it for me!

[chemzqm]

Figured out dart language server expect optional rangeLength field on document change params, I've added that field, so forceFullSync not needed any more.