Importing OPML files fails to include folders within folders

[Ron-TheDev]

Checklist

• [x] I've already searched in existing issues and haven't found a similar problem reported.
• [x] I'm using the latest version of the app
• [ ] This error caused the app to crash
• [x] This error is reproducible

Which category best fits this error?

Others

App version

0.14.5

Reproduction steps

While importing local files exported from Liferea, folders within folders are not shown (potentially not imported).

1. Create feed in liferea with sources in folders within folders
2. Export feed as .opml file
3. Import .opml file

[Ron-TheDev]

Example folder structure.

[CXwudi]

Hi, sorry to bother you, but what RSS Reader is that in the screenshot that support nested folder? TTRSS maintainer is deprecating TTRSS and I am looking for a new web RSS Reader that support nested folder