Article content disappears when Archive button at bottom of page pressed

[NateEaton]

What happened?

If the Archive button at end of bookmark content is pressed when the article has content downloaded for offline reading, the screen goes blank.

Steps to reproduce

1. have a bookmark open in reading mode
2. read through to end then presss Archive button at bottom of page
3. content area of window goes completely blank, no content and no buttons
4. scrolling or menu usage doesn't change anything
5. exiting to list view, going to Archive and re-opening the article everything looks fine
6. doing this on Picture bookmarks, the picture doesn't disappear but the buttons disappear for a second or two and then reappear
7. doing this on Video bookmarks, the issue doesn't occur
8. the issue doesn't occur with the Favorite button (set or unset)
9. the issue doesn't occur when when unsetting the Archive Bookmark button
10. the issue only occurs if a) reading offline is enabled and b) the article (or picture) bookmark is one for which there is offline content downloaded

Expected behavior

Bookmark archive should be set but content and buttons still displayed.

MyDeck version

v0.12.0 preview

Android version and device

Any

Logs or debug info (optional)

[NateEaton]

The issue is due the fact that offline content is removed when a bookmark with offline content is archived.

Planned solution is to defer removing the content until the bookmark is closed.