Ilya

> On Windows it would already help. Ok, then I'll manually test it on Windows. > Sorry, I mean tests. Unit/code tests. Nextcloud currently don't have tests for similar things,...

Now new file isn't overwritten if already exists. Added test for ` tryMigrateCookieJar()`.

I checked log generation on Linux, it records to `~/.local/state/logs`. On MacOS and Windows it _should_ work, because it uses write location and create dirs if it doesn't exist, but...