@alranel
If I'm not wrong this directory is the one containing files used for Language Server and Debugger.
@cmaglie and @silvanocerza can you confirm?

I confirm what @ubidefeo is saying. I don't think we should make this change, all in all I think it has been an improvement.

We could offer a way for user to delete all those temporary folders though. There's already a cache clean command, we could take advantage of it to also delete all arduino-sketch-<md5_hash> in the temp folder.

Perhaps the oldest leftover temporary files could be found and deleted? It could be based on the file age, or space used, or both. A few people might not want any files left over, but probably most people just wish to avoid boundless growth over long term use.

@silvanocerza @PaulStoffregen
one would assume that an Operating System deleted files in temporary folders every now and then.
I think we could leverage cache clean to do that

Gotcha. I was under the erroneous assumption that everything we store under /tmp are temporary files but I understand we're also storing cache files there. I believe there are more standard places where to store cache files, such as ~/Library/Caches on macOS and ~/.cache on Linux, and there's also a XDG_CACHE_HOME env variable.

Apart from location, maybe using the prefix arduino-cache- in combination with the proposed cache clean command could help.

(Feel free to close this pull request of course)

Perhaps the oldest leftover temporary files could be found and deleted? It could be based on the file age, or space used, or both. A few people might not want any files left over, but probably most people just wish to avoid boundless growth over long term use.

This suggestion has been implemented. I am closing this issue as resolved.