Improve error message when a workspace folder is inaccessible #1276
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On Linux when using a LSP client that does not support watching files on behalf of the server, we'll use Parcel Watcher (if possible). If we start the watcher with a non-existent or inaccessible directory, it will throw an error with a very unhelpful message: "Bad file descriptor".
The best thing we can do is an initial check for access to the directory and log a more helpful error message if it fails:
See #884 (comment)