OPDS Plus v1.3.1

A bug-fix release: you can now reach the rest of a long feed after jumping to the last page, downloads get a proper file extension and a sensible default folder, and each catalog page takes one request instead of two.

Changed

• One Request per Catalog Page: Opening a catalog page used to ask the server for its headers and then for the page, so a server that builds the whole feed both times, like Calibre-Web, did the work twice. Each page is now a single request. A server that tags or dates its feeds answers "not modified" when the copy on the device is still current.

Fixed

• Rest of a Long Feed Unreachable: Jumping to the last page with the end chevron or the page number dialog left the next page button greyed out, so the rest of a long feed, such as a Calibre-Web shelf, could only be reached by swiping. The next part of the feed is now fetched when you land there (Issue #100).
• Downloads Without a File Extension: A book whose download address had no extension, such as /download/7, or one KOReader can't open, such as get.php, was saved under that name and could not be opened. The extension of the chosen format is now added.
• Download Folder When None Is Set: Without a download folder chosen, books were saved to the last folder opened in the file browser, which on a first start is KOReader's hidden help folder. They now go to the home folder, as in KOReader's own OPDS browser.
• Where to Set the Sync Folder: Syncing without a sync folder now tells you where to set one: the menu at the top left of the list of catalogs, under Set sync folder.
• Duplicate PDF Download Buttons: A PDF link was sometimes added to a book twice, so the format list read "EPUB, PDF, PDF" and a book with a single PDF asked which format to download. This happened with arXiv's feeds.

Notes

• If you never chose a download folder, new downloads now go to your home folder instead of the last folder you browsed. Tap Choose folder in the download dialog to pick another.

Full changelog:
https://github.com/greywolf1499/opds_plus.koplugin/blob/main/CHANGELOG.md