Fix LSP ComplitionTriggerKind value for TriggerKind::Auto

[nkitsaini]

Spec: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#completionTriggerKind
See the related issue for more details.

Fixes: #9656

[pascalkuthe]

#9656 (comment)

[pascalkuthe]

ok the vscode code is pretty opaque but you are right that indeed we should be sending invoked for identifier triggered auto completions. I find that a bit odd but oh well. The implementation is not correct tough. The completion debouncer runs in a background task/thread. Even if the completion was originally caused by autocompletion we could now be at a trigger char (or not anymore).

So we should not be looking at trigger.kind beyond checking if it is set to manual. You should determine whether to use INVOKED or TRIGGER_CHARACTER by checking if trigger_char.is_some()

[nkitsaini]

ok the vscode code is pretty opaque

Yeah, I tried to go through it yesterday night but wasn't very confident. But I was to able to confirm the behavior by enabling debug logs for both svelte and rust-analyzer plugin in vscode and looking at LSP message logs.

So we should not be looking at trigger.kind beyond checking if it is set to manual. You should determine whether to use INVOKED or TRIGGER_CHARACTER by checking if trigger_char.is_some()

Makes sense, updated the PR.