Leave annotations during re-build

[sunjay]

I don't know what the actual term is, so by "annotations" I'm referring to lines with errors or warnings.

I've noticed that every time I save all of the annotations disappear while things are being re-built. This is pretty distracting and slows me down as I have to wait a couple seconds for things to re-appear in order to figure out what to fix next. It would be great if the annotations could stay around until the new ones are available to replace them.

[alexheretic]

They're called diagnostics in LSP, they come from textDocument/publishDiagnostics messages.

Each message tells us about all the errors in the project, so a message with no errors means there are no errors. rust-analyzer sends a bunch out, presumably streaming the cargo watch -x check output as it comes.

So the first message out will clear all the old ones until the new cargo check run re-spits out the new diagnostic. RLS waited until the end of a build to publish them, so this didn't apply (but it also took longer to see changes).

I'm not sure of a better way of dealing with this, maybe there's some server config that can help?