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272dba7f07
Problem: Directories that are "trusted" by `vim.secure.read()`, are not detectable later (they will prompt again). https://github.com/neovim/neovim/discussions/33587#discussioncomment-12925887 Solution: `vim.secure.read()` returns `true` if the user trusts a directory. Also fix other bugs: - If `f:read('*a')` returns `nil`, we treat that as a successful read of the file, and hash it. `f:read` returns `nil` for directories, but it's also documented as returning `nil` "if it cannot read data with the specified format". I reworked the implementation so we explicitly treat directories differently. Rather than hashing `nil` to put in the trust database, we now put "directory" in there explicitly*. - `vim.secure.trust` (used by `:trust`) didn't actually work for directories, as it would blindly read the contents of a netrw buffer and hash it. Now it uses the same codepath as `vim.secure.read`, and as a result, works correctly for directories.