Implement lsp extension for cancelling running flychecks

[Veykril]

Fixes #4828

[Veykril]

@bors r+

[bors]

📌 Commit 45b7b6a has been approved by Veykril

It is now in the queue for this repository.

[bors]

⌛ Testing commit 45b7b6a with merge 04c487d...

[bors]

☀️ Test successful - checks-actions
Approved by: Veykril
Pushing 04c487d to master...

[RalfJung]

This is awesome. :)

How do I trigger cancelling the running checks from the UI?

[Veykril]

For VSCode, without any setup you'd need to bring up the command bar(? not sure if thats the name) via ctrl + shift + p and then type out Cancel running flychecks until you find that and invoke it.

The other way is to set up a keybinding to invoke the rust-analyzer.cancelFlycheck command

[Veykril]

I wanted to make the small cargo check spinner in the status bar clickable but that thing is actually not managed by the r-a client at all so we don't have control over that 🙄 Will have to look into other options there