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a03ab03a10
Problem: `:lsp restart` detects when a client has exited by using the `LspDetach` autocommand. This works correctly in common cases, but breaks when restarting a client which is not attached to any buffer. It also breaks if a client is detached in between `:lsp restart` and the actual stopping of the client. Solution: Move restart logic into `vim/lsp/client.lua`, so it can hook in to `_on_exit()`. The public `on_exit` callback cannot be used for this, as `:lsp restart` needs to ensure the restart only happens once, even if the command is run multiple times on the same client.