Deleting all downloaded chapters directly on the manga view doesn't reduce disk usage to 0B.

[MariusAlbrecht]

The original issue was found to have a solution, I still think theres an issue to be solved though, see #1226 (comment)

Brief summary

When downloading chapters kotatsu creates index.json and cover.* (one of multiple image formats) metadata files alongside the *.cbz files representing the actual chapters. These do not get deleted when the user deletes all downloaded chapters through the app and can only be removed manually using a file management app. I expect the app to clean up those files, especially when their disk usage is shown in the UI.

I think deleting them when the last downloaded chapter gets deleted is best.
An alternative would be to just add a button and let people do it manually in the app. That button could be placed in the "Saved manga" popup next to the "Delete read chapters" button:

Steps to reproduce

1. download a chapter
2. delete it again
3. see a few kB of disk usage in the app
4. see cover image and index json files in the respective directory

Kotatsu version

7.7.4

Android version

12

Device

OnePlus 7 Pro

Acknowledgements

• This is not a duplicate of an existing issue. Please look through the list of open issues before creating a new one.
• This is not an issue with a specific manga source. Otherwise, you have to open an issue in the parsers repository.

[kuflierl]

Actually I thought that the last chapter never got deleted using that modal. Deleting using the long press delete modal in the "on device" tab seems to do a fine job of getting rid of everything.

[MariusAlbrecht]

Favourites > On Device > 🗑️ removes the manga from favourites and doesn't even delete any chapters.

[kuflierl]

Favourites > On Device > 🗑️ removes the manga from favourites and doesn't even delete any chapters.

I was't talking about favourites>on-device

I am talking about the on-device tab you get by adding it to the bottom nav bar in settings

[MariusAlbrecht]

Oh wow I didnt even know that exists, you were right.
I still think this issue has validity.
(a) I wouldnt have found the solution by myself
(b) metadata should probably get automatically deleted when no chapters are left