Protect local directory from being deleted in Kmail

[SignKirigami]

By the way, I use kmail 24.12.3. If anyone is interested in this, probably I can try to make a merge request.

于 2025年3月18日 GMT+08:00 15:30:58，SignKirigami <prcups at krgm.moe> 写道：
>Hello, I deleted local directory in kmail occasionally, after that every time I started kmail, it alerted error and exited. I have to reset it by deleting its config file. So I think whether protecting these directory from deleting will be better.
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