A correctness and stability release. A few new reading options, much safer saving and backups, and a long list of fixes.

• New:
  
  • Single Page Mode shows one page at a time regardless of the window size.
    
  • Choose the page fit policy, so pages fit by width, by height, or whole.
    
  • A Controls Hide Delay setting in Customize Controls picks how long the overlay stays visible.
    
  • When the selected text contains a link, the web search button becomes an Open Link button.
    
  • Searching now happens without leaving the document.
    
  • The first jump lands in reading history, so Jump Back returns you where you were.
    
  • The previous and next arrows wrap around at both ends in every search flow.
    
  • When every match is behind you the search wraps to the first one, and says so when there are none.
    
  • Double tap zoom now uses two states by default, with the old three states available in Advanced settings.
    
  • The fullscreen exit button reads Exit Fullscreen instead of Exit.
    
  • A file shared from another app now asks before copying when it is very large or space is tight.
    
  • That dialog offers keeping a copy, granting file access, or just reading it once.
    
  • Keep Copies of Shared Files becomes a choice between always keeping a copy and asking each time.
    
  • The theme toggle button stays visible when the PDF theme follows the system.
    
  • Tapping it then explains why it cannot toggle and lets you pick a theme right there.
    
  • The book title snackbar fits longer titles.
    
• Library:
  
  • A document can no longer land in the library with an unknown page count.
    
  • A document already stored with the wrong page count is corrected the next time you open it.
    
  • Documents are identified by the hash of the first and the last MB of the file, so two files sharing a first megabyte no longer merge into one.
    
  • Files under two megabytes are identified by their whole contents.
    
  • Existing records convert quietly on open, keeping reading position and bookmarks.
    
  • Conversion is anchored to the real file, so a copy can never claim another book's history.
    
  • Home's relocate picker now heals the record even after the screen is recreated.
    
  • The reader's relocate picker verifies the picked file before repointing the record.
    
  • Backing out of that picker exits the reader again as intended.
    
  • Deleting a document now removes it correctly for every kind of file location.
    
  • Home no longer shows a stale list when two refreshes overlap.
    
  • Relinking the library no longer scans files on the screen thread.
    
  • A document with no address no longer displays the literal word null.
    
• Saving:
  
  • Highlights made while a save is running are no longer thrown away.
    
  • Saving no longer reports success when the written file might be damaged.
    
  • The check now reads the end of the file, not just the start.
    
  • A failed save no longer retries in a way that can ruin a good file.
    
  • A spare copy is kept for password protected files too.
    
  • Saving a copy can no longer overwrite the file you are reading.
    
  • Updating a different file by mistake now asks you first.
    
  • Annotations can no longer be written to another document's chosen destination.
    
  • Saving no longer opens and re reads every highlighted page.
    
  • Saved files no longer grow with pages that did not change.
    
  • A saved file no longer balloons with a hidden copy of everything you read before saving.
    
  • Saving a file that was inflated by an older version shrinks it back to its real size.
    
  • Edits are refused politely while a save is running instead of being lost.
    
  • Deleting a document no longer races a reader that still holds unsaved highlights.
    
• Highlights and Signatures:
  
  • Fixed highlighting in books where it silently failed.
    
  • Highlights no longer appear in a file that does not contain them.
    
  • A highlight that cannot be drawn now says so instead of pointing somewhere else.
    
  • Opening a highlight from the list centers the page counter and bookmark star correctly.
    
  • Dragging a selection handle is smoother and no longer redoes work on every touch event.
    
  • A signature no longer lands sideways on a rotated page.
    
  • Dragging a signature now moves it the way you drag it.
    
• Reading:
  
  • Navigation History opens whenever the trail holds anything, even when every entry is ahead of you.
    
  • The page you are on is now tracked wherever the view moves, so the number in the bar is always the page you are looking at.
    
  • Jumping to a search result or a highlight now leaves you on that page, so leaving and returning brings you back to it.
    
  • Auto scroll now keeps the page number, the reading history and the saved position up to date as it goes.
    
  • Fullscreen now covers the camera cutout area instead of leaving a black band on notched phones.
    
  • Reading position is no longer erased when Always Open at First Page is on.
    
  • Right to left books no longer jump to the wrong end of the document.
    
  • Right to left books no longer save the wrong page when you leave.
    
  • Pages are centered instead of pushed to one side.
    
  • A document no longer turns a page by itself when it opens.
    
  • The first tap after opening toggles the controls instead of being swallowed.
    
  • Contents entries no longer show page 0 or jump to page 1.
    
  • Contents rows that resolve to nothing now show nothing and do nothing.
    
  • A finished one page book shows 100 percent.
    
  • Two page spreads show both page numbers when you jump.
    
  • First Page Alone shows as overridden while Single Page Mode is on.
    
  • Double tap zoom stays within your configured maximum zoom.
    
  • A drag cancelled by the system snaps the page and hides the handle.
    
  • A drag started right after a page turn is no longer ignored.
    
  • Auto scroll stops when you leave the reader and stays consistent afterwards.
    
  • Always Hide Margins now applies after you return from settings.
    
  • Rotate reads the real screen orientation, and explains itself when the system controls the window.
    
  • Rotation lock clears when you close the app.
    
• Text Mode:
  
  • Going to a page now moves the text, not just the page number.
    
  • A page you jumped to stays put while the pages around it load.
    
  • Hyphen wrapped words read as one word.
    
  • Search boxes land on the right letters around ligatures.
    
  • Arabic search boxes use the correct character positions.
    
  • Text sizes and spacing are clamped to safe values when loaded.
    
  • Web search no longer crashes when no browser is installed.
    
  • Quote cards stay left to right for mostly English quotes.
    
• Search:
  
  • Search next and previous can no longer freeze the screen, even in rare cases.
    
  • Repeated presses land on the right match every time.
    
  • Results are added to instead of being rebuilt from scratch.
    
  • A running search no longer holds the whole reader in memory.
    
• Backup and Restore:
  
  • Backups keep working on Arabic and Persian phones.
    
  • Restore Pre Import Snapshot appears again after an import.
    
  • Backup cleanup keeps the newest files instead of the oldest.
    
  • An import stops safely when its snapshot cannot be found.
    
  • An import can no longer be interrupted midway by leaving the app.
    
  • The wipe warning now says that unsaved highlight recovery data and the stored signature are deleted too.
    
  • Imported settings are rejected unless they are known and correctly typed.
    
  • Two backups of the same name no longer corrupt each other on import.
    
  • The Auto Backup switch no longer reads on while nothing is scheduled.
    
  • The stalled backup notice now works for people who enabled automatic backup before it recorded a start date.
    
  • The offline dictionary no longer eats most of the system backup quota.
    
  • Backups record where a document came from, without changing the file format.
    
• Privacy and Permissions:
  
  • Incognito stays incognito when the screen rotates while the file picker is open.
    
  • No lasting file permission is kept for a file opened in incognito.
    
  • Bookmarking a page in incognito now explains why it cannot, and offers to exit incognito.
    
  • Placing a signature in incognito no longer stores the drawn signature for later sessions.
    
  • Crash reports show the website instead of the file path.
    
  • A crash report is never sent unless you agree to it first.
    
  • Internal warnings about slow document work are no longer reported at all.
    
  • A report left over from an older version is deleted instead of sent.
    
  • A download that stops being encrypted part way asks before it continues.
    
  • A download that is not a PDF is refused instead of saved.
    
  • A download stops if it grows past a sane size or would fill the device.
    
  • Three internal screens can no longer be opened by other apps.
    
  • Android 10 and below now ask for write access as well as read access.
    
  • Copies written to public storage appear in other apps right away.
    
• Home:
  
  • Back ends an active selection on the Folders tab instead of walking up a folder, matching the other two tabs.
    
• Design:
  
  • Onboarding buttons no longer hide behind the three button navigation bar.
    
  • The home open button no longer collides with the navigation buttons.
    
  • The tip explaining how to leave fullscreen now actually appears, and stays gone once dismissed for good.
    
  • Release notes now appear for people who turned the Home page off.
    
  • Settings search says when nothing matched.
    
  • Renamed a label that two unrelated features were sharing.
    
  • Russian and Ukrainian delete warnings show the real count.
    
  • Clearing a single item no longer reports it in the plural, in every language.
    
• Performance and Stability:
  
  • A page carrying an enormous amount of text now says so instead of killing the app.
    
  • Large scanned books no longer crash the reader on low memory phones.
    
  • Memory stays bounded no matter how long the book or how far you scroll.
    
  • The reader menu no longer slows the app down or pushes it toward a crash.
    
  • Fixed a rare crash while scrolling caused by preview images being reused mid draw.
    
  • Fixed a rare crash while cleaning up stored page previews.
    
  • Urgent page renders no longer get stuck behind background ones.
    
  • Cancelled renders restart instead of dying.
    
  • A cancelled page preview no longer keeps its page open.
    
  • A stale preview can no longer stick after an edit.
    
  • Highlights are no longer regrouped on every drawn frame.
    
  • Opening a highlight from the list no longer looks it up twice.
    
  • Text screens no longer leak a document when closed while still opening.
    
  • Go To Page no longer leaks its window and a document.
    
  • Reopening the same reader now honors the newly opened document.
    
  • An empty reader window no longer closes the window holding your document.
    
  • Tapping a page no longer searches it for form fields.
    
  • Low memory image allocation failures no longer crash the viewer.
    
  • A failed image decode no longer loses a reusable image buffer.
    
  • A missing gesture event no longer risks a crash while flinging.
    
  • Android 6 no longer crashes on online PDFs.
    
  • Android 6 no longer crashes while installing the dictionary.
    
  • Document loading no longer reads settings off the wrong thread.
    
  • Fixed a file reading bug that could feed the app garbage.
    
  • Fixed a mismatch between two parts of the low level code.
    
• Development:
  
  • The two native dependency build scripts merged into one.
    
  • Building PDFium from source is now the default, with a prebuilt option.
    
  • Build a single processor architecture or all four.
    
  • A dry run mode previews the build before running it.
    
  • libpng and FreeType versions are pinned and their checksums verified.
    
  • The Gradle download is verified by checksum.
    
  • Crash report settings moved into the committed project config.
    
  • Fixed the crash dialog missing from store and F-Droid builds.
    
  • A release runbook was added and the setup docs refreshed.
    
  • The viewer library now ships its own shrinker rules.
    
  • Removed 45 unused texts from all 16 languages.
    
  • Removed nine dead color, size, and state values.
    
  • Split large functions into focused pieces.