Check on debounce

[Milo123459]

Perhaps, if you stop typing for a period of time, it automatically runs the check command? The TS extension does this, but it does it because of how fast it can be in doing this. If it is managed to be heavily optimised, it could even run when typing.

Possibly related (on the speed side): #10149

[bjorn3]

The cargo check command can only run after you save (manually or autosave) due to rustc only being able to read files from the disk and not from the rust-analyzer vfs. See #3107.

[lnicola]

Check runs on save, and you can configure Code to save automatically after a delay. We can't show the cargo check diagnostics without saving the files (because cargo reads them from disk) and we shouldn't save files automatically neither in Code nor in other editors (because it's the editor's job to write the files to disk).

The cache priming is unrelated, it's just precomputing information about the symbols and exports in the project.

[Milo123459]

Ah, alright. I guess to get something like this more static analysing would need to be done. Thanks.