LSP Extensions support

[fannheyward]

• https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/dev/lsp-extensions.md
• Announcements: Client Changes rust-lang/rust-analyzer#4604

Name	PR	Status
SnippetTextEdit	rust-lang/rust-analyzer#4494	Done #252
CodeAction Groups	rust-lang/rust-analyzer#4569	No Plan
Parent Module	rust-lang/rust-analyzer#4611	Done 14001ac
Join Lines	rust-lang/rust-analyzer#4557	Done #259
On Enter	rust-lang/rust-analyzer#4607	No Plan
SSR	rust-lang/rust-analyzer#4560	Done c47c988
Matching Brace	rust-lang/rust-analyzer#4593	Done ad3656e
Runnables	rust-lang/rust-analyzer#4710	Done d9e8102
Lazy assists with ResolveCodeAction	rust-lang/rust-analyzer#4717	Done ddd83c5
Hover Actions	rust-lang/rust-analyzer#4729	Done 06b4c92
Reload Workspace	rust-lang/rust-analyzer#5169	Done 15bd717
Status Notification	rust-lang/rust-analyzer#5188	Done 3a055d6
Analyzer Status	rust-lang/rust-analyzer#6096	Done 473a2a8
Open External Documentation	rust-lang/rust-analyzer#5917	Done 04c51ad
Open Cargo.toml	rust-lang/rust-analyzer#6462	Done 35958ab
Syntax Tree		Done
Expand Macro		Done
Inlay Hints		chainingHints #220 typeHints eeda508
View Hir	rust-lang/rust-analyzer#7068	Done f5720cc
View File Text	rust-lang/rust-analyzer#11861	Done 3a69d37
Related tests	rust-lang/rust-analyzer#7799	Done c00285d
Hover Actions	rust-lang/rust-analyzer#8054	Done f65c4c2
View Crate Graph	rust-lang/rust-analyzer#8801	Done 198bf44 70a051e
View ItemTree	rust-lang/rust-analyzer#8916	Done 8b49b7d
Lookup workspace symbol	rust-lang/rust-analyzer#7698	Done a1b7e16
Hover Range	rust-lang/rust-analyzer#9693	Done #839
Run flycheck	rust-lang/rust-analyzer#13792	Done e259fca
Cancel running flychecks	rust-lang/rust-analyzer#13063	Done 73248ba
Clear flycheck diagnostics	rust-lang/rust-analyzer#13792	Done e259fca
Rebuild proc macros		Done bd049c9
viewMir		Done 4254c94
Interpret Function		Done 90eb4b7

[oblitum]

fwiw, at #252, the two reports of testers at the end pointed that snippet placeholder selection isn't working.

[fannheyward]

@oblitum selection in same file works as expect, but fails on another file, this also happens with RA+VSCode extension, rust-lang/rust-analyzer#4551.

I've disabled selection for different file.

[oblitum]

I only tested it in same file, didn't work for me. Meaning, just writing foo() and expanding it I get to the end of the file as reported before, which I thought was the same report by @TimoFreiberg, but I'm not sure he was reporting the same trivial test now.

[fannheyward]

@oblitum can't reproduce the error in same file tests, selection will not go to the end of file.

[oblitum]

k, fwiw, this is my setup:

vim version: NVIM v0.4.3
node version: v14.3.0
coc.nvim version: 0.0.78-3c774fbfa5
coc-rust-analyzer version: 0.7.2
rust-analyzer version: fbb8b88
coc.nivm directory: /home/francisco/.vim/plugged/coc.nvim
platform: linux

If @TimoFreiberg could chime in to state whether this report was about a trivial test in the same file or not, it would be great.

[fannheyward]

@oblitum reproduced your issue, very very weird behavior:

fn main() {
    foo();
} // -- no new line EOF

this will add foo function with selection on |}|.

fn main() {
    foo();
}
// -- with new line EOF

this will add foo function with selection on todo!().

[oblitum]

@fannheyward I confirm it's just like that.

[TimoFreiberg]

Sorry for the delay, yeah I was also talking about that.
Interesting that it seems to work as expected when there's a newline at the end - rustfmt removed that on save so I didn't notice that case.