Support for sub-entries?
Multiple ebook files can already be grouped under one entry, but I'd like to see groups of sub-entries that can have different metadata in addition to the main entry's metadata. For example, versions of the same book - this would be especially useful if they have different titles.
You could also group an audiobook as the main entry together with its PDF supplement as a sub-entry. To that end, it would be useful to have support for sub-sub-entries.
Each sub-entry and sub-sub-entry would have its own row, but they'd be visually grouped together and act as one entry for sorting/search. Metadata fields for sub-entries can be filled or left empty or marked as inherited from the main entry. Each metadata field could have its own default behavior for new sub-entries: copied, empty or inherited.
An alternative view could be enabled which treats each sub-entry as separate, so e.g. you can search among just your audiobooks even if some of them are sub-entries that are grouped together with other formats. Also, while using the grouped view, a checkbox by the search box could be used to enable filtering out sub-entry rows even while the matching rows are still grouped.
Does this sound like a good idea? Is there anything like this already? Has it been discussed as a potential new feature?
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