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bbfcde3ab2
Problem:
lsp._capability.is_enabled() can raise error if buffer is invalid in client:on_attach().
- error
```
./build/bin/nvim --clean --headless +"source ./minimal.lua"
vim.schedule callback: ...omo/workspace/neovim/runtime/lua/vim/lsp/_capability.lua:209: scoped variable: Invalid buffer id: 2
stack traceback:
[C]: in function '__index'
...omo/workspace/neovim/runtime/lua/vim/lsp/_capability.lua:209: in function 'is_enabled'
...e/notomo/workspace/neovim/runtime/lua/vim/lsp/client.lua:1108: in function <...e/notomo/workspace/neovim/runtime/lua/vim/lsp/client.lua:1101>
```
- reproduction minimal.lua
```lua
vim.opt.runtimepath:append("/path/to/nvim-lspconfig/")
vim.lsp.enable("lua_ls")
vim.cmd.tabedit("runtime/lua/vim/_defaults.lua")
vim.api.nvim_create_autocmd({ "LspAttach" }, {
group = vim.api.nvim_create_augroup("test", {}),
callback = function()
vim.cmd.tabedit("runtime/lua/vim/_defaults.lua")
local bufnr = vim.api.nvim_get_current_buf()
vim.api.nvim_buf_delete(bufnr, { force = true })
end,
})
```
Solution:
Check whether buffer is valid.