Feature request: Expose "Archive" (cache limitations) settings in the Advanced feed creation dialog

[nekohayo]

Half of the time, when I'm adding a feed, I want to specify a property so that this feed has an unlimited number of items that can be downloaded/cached, when it's a really important website.

However, Liferea currently only allows me to add the feed, and then later go into its properties to set the "Archive > Unlimited cache" property:

...but by then it is already too late, as Liferea already limited itself to a handful of items on the 1st download of that subscription.

I would like to be able to set the custom cache limitations properties right when I first add/create the feed subscription, before it does its first refresh/pull, so that it can pull as many items as possible from the start. Maybe in the dialog that appears from the "Advanced" button in the subscription dialog?

[lwindolf]

Had a short look at the feasibility. It is really hard because the properties are stored as members of the "feed" object, which is only instantianted by a "node source" implementation long after the dialog is closed.

Moving all those properties into the "subscription" object would help, but the long list of members hints on a design issue :-(

I'm still doing data schema design for https://github.com/lwindolf/newsagain where I want to keep all the learnings in from maintaining Liferea. I might come back to this when I thought about a good data schema.