Exclude swap files (.swp) from containment statements

https://fileinfo.com/extension/swp

.swp file is created when a text editor like nano or vim opens a file in a directory. When the editor is closed, the swap file is removed.

While swap files exist in a directory, NSS includes them in containment statements.

My attempts to GET the .swp file resulted in a 404, but this could still be a potential risk. At the very least, it does expose information when it really shouldn't.

I suggest excluding .swp from containment statements.

該 issue 提到了 containment statements 和 .swp 檔案，但沒有指出實作檔案或測試。首先定位產生 containment statements 的程式碼，並使用暫時的 .swp 檔案重現該行為。當 .swp 檔案被排除在 containment statements 之外，且不會破壞其他檔案的處理，同時相關測試通過時，即表示完成。