Anki 23.12

What's new in this version:

FSRS:
- Minor improvements to the algorithm (FSRS 4.5). While not essential, we recommend you re-optimize your FSRS parameters after updating
- The deck options Save dropdown now lets you optimize all presets at once
- Rewrite the optimal retention code. The new code will give different results
- The search used for optimizing presets is now remembered
- Exclude suspended cards from optimization by default
- When using 'deck:*' in the search, reviews from deleted cards are included
- The reschedule-on-parameters-change option is now shared between all presets, and will default to off each time
- When cards are rescheduled multiple times without reviews, extra entries will not be added to the review log
- Fix some bugs in sorting by FSRS retrievability
- Clarify learning steps recommendation
- Ignore filtered revlog in time of last review
- Fix FSRS scheduling when add-ons manually convert cards to learning
- Better approximate average retention/ease/difficulty
- Don't use SM2 memory state when cards are manually introduced
- Fix incorrect search being used when evaluating parameters
- Recompute FSRS memory state when cards moved into different deck
- Correct the description of FSRS Difficulty in Stats
- FSRS ignores revlog entries with time = 0 when calculating time taken
- Keep two decimals for stability
- Improve calculated difficulty for cards that skipped initial learning
- Catch NaNs in FSRS parameters

Deck options screen:
- Added a new v3 option to limit child decks by their parent, when clicking on the child
- Added an auto-advance feature. Activate from More menu; configure via deck options
- The deck options screen now opens faster
- Change link to manual in help screen from icon to text
- Make help button more obvious, and remove hover animations
- Add a globe icon to global settings in the deck options
- Fix some RTL issues in help modals
- Do not close web pages when Esc is pressed and a modal is open

Other scheduling/review-related changes:
- When rescheduling is disabled in a filtered deck, you can now choose different delays for again, hard and good. Set to 0 to have that button immediately remove the card.
- The 'preview new cards' option in custom study now uses note-added order
- Don't restrict answer key shortcuts to alphanumeric characters and a few symbols
- Include elapsed_secs in learning card state
- Fix cards showing up due in the past in a filtered deck
- Fix filtered deck ordering of intraday learning cards and reviews
- Support all MathJax modules in review screen
- Add hint for zero minutes in filtered deck
- Fix relative overdueness order error in filtered deck

Image occlusion:
- Add keyboard shortcuts to Image Occlusion, and fix a number of issues
- Fix image occlusion not showing up in Qt5
- Don't show an error when opening add screen when the existing I/O notetype is invalid
- Fix overlapping I/O icons in some languages
- Fix changes to groups of I/O masks not saving
- Fix switching of add & history buttons when selecting IO notetype
- Fix IO card count

Import/export:
- Allow importing/exporting with/without deck configs
- Fix CSV importer dropdowns not updating after changes
- Fix inability to search for existing notes in CSV import screen
- Fix broken HTML in CSV import screen

Editor:
- Fix image overlay not closing when clicking outside on Qt6.6
- Clear editor's internal copied text on cut/copy
- Fix Mathjax can only be pasted once
- Improve confirmation message in Add screen
- Fix macOS clipboard issues
- Improve visibility of clicked buttons in editor

Card info:
- Show due date of buried/suspended cards in card info
- Hide "position" in card info when card not new
- Show actual due date of learning cards in Card Info screen
- Bring card info window to top if card info action used again

Browser:
- Ensure cloze numbers sort in order when sorting by card template
- Fix sorting by due column in notes mode
- When sorting by due, intraday and interday intervals are no longer separated
- Calculate elapsed days for intraday learning cards in browse screen and relative overdueness sorting.

Platform changes:
- Update to PyQt 6.6.1 on all platforms.
- Platform CSS has been reimplemented. Standard selectors like .win and .mobile should continue to work; more obscure ones that weren't documented will not
- Automatically disable sandbox on Qt5 PyPi/packaged builds on Linux, as is required on modern glibc versions
- The Qt6 Apple Silicon build now correctly declares it requires macOS 12+ to run, instead of crashing on startup
- Update licensing info of a few third-party modules
- Mention environment variable YARN_BINARY in documentation

Other:
- Improve keyboard handling and accessibility of dropdown boxes
- Resolve some accessibility issues for tag options buttons
- Ensure deck browser fetches collection data in the background
- Fix sync status check blocking collection access when network offline
- Ensure correct endpoint is used when syncing from Rust
- Ignore rescheduled cards in old stats page
- Do not add a fallback field reference if front side contains conditionals
- Ensure progress windows get cleaned up
- Fix mpv idle notification not using main thread
- Fix mpv not working out of the box in win32 source build
- Handle invalid install timestamps in add-ons
- Offer to save changes when card layout screen is closed
- Make the error dialog shown when an error occurs more friendly
- Refresh model list when legacy addon adds notetype