fix: enforce single file mode check when root_dir differs from client #2998
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fixes issue #2959
After executing
:LspRestart
nvim-lspconfig tries to reuse the same client (tsserver, ...) but this causes buffers from different root_dirs to fall into single_file_mode (1 tsserver per buffer) even if single file mode is turn off. This PR enforces the single file mode check before trying to reuse a client from other root_dir.