Expose `vim.lsp.buf.diagnostics_by_buf`
This makes it easier to customize the diagnostics behavior. For example
to defer the update they can override the
`textDocument/publishDiagnostics` callback to only call
`buf_diagnostics_save_positions` and then defer the other actions to a
autocmd event.
- os.exit(1) is too generic, since code 1 may be caused by Nvim exiting
for some other reason. Change it to os.exit(101).
- style: de-architect json_encode/json_decode calls.
Failure seen in travis macOS job:
https://travis-ci.org/neovim/neovim/jobs/647849133
[ FAILED ] test/functional/plugin/lsp_spec.lua@ 266 SP basic_init test should not send didOpen if the buffer closes before init
test/functional/plugin/lsp_spec.lua:297: exit code
Expected objects to be the same.
Passed in:
(number) 1
Expected:
(number) 0
stack traceback:
test/functional/plugin/lsp_spec.lua:297: in function 'on_exit'
test/functional/plugin/lsp_spec.lua💯 in function 'test_rpc_server'
test/functional/plugin/lsp_spec.lua:272: in function <test/functional/plugin/lsp_spec.lua:266>
