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a1bc5d0ae6
Fixes #35884 Problem: Since `once_buf_loaded` might call a callback passed to it at a later point (which is it's reason to exist) that callback might end up referring to stale diagnostics in a handler's `show` function. For example, if we first call `vim.diagnostic.set` for an unloaded buffer, then call `vim.diagnostic.reset` and only then load the buffer, we might still see diagnostics from `vim.diagnostic.set` call, which are stale at this point. Solution: only keep one autocommand from the most reset `show` call and delete it when `hide` is called.