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Transmission 4.0.0-beta.3

What’s New in 4.0.0-beta.3

libtransmission (All Platforms)

• Dropped obsolete CyaSSL and PolarSSL crypto backends (WolfSSL and MbedTLS are still supported). (#4495)
• Updated extension protocol handshake to include yourip value as suggested by BEP 10. (#4504)
• Fixed out-of-order teardown bug that could cause a crash on shutdown. (#4331, #4348, #4451)
• Fixed 4.0.0-beta.1 bug that broke detection of a peer’s UDP port in a peer handshake. (#4334)
• Fixed 4.0.0-beta.2 regression that broke port forwarding in some settings. (#4343)
• Fixed 4.0.0-beta.2 bitfield crash. (#4346)
• Fixed 4.0.0-beta.1 pattern matching in whitelist and host_whitelist. (#4353)
• Fixed 4.0.0-beta.2 crash when pausing a torrent. (#4358)
• Fixed 4.0.0-beta.2 IPv6 μTP socket binding regression. (#4469)
• Followed BEP 7 suggestion to remove &ipv4= and &ipv6= query parameters from tracker announcements. (#4502)
• Followed BEP 7 suggestion to make the tracker announce &key= query parameter unique per-torrent. (#4508)
• Updated the bookkeeping to ensure both TCP and uTP connections honor the connection limit. (#4534)
• Made small performance improvements in libtransmission. (#4393, #4401, #4404, #4412, #4424, #4425, #4431, #4519)
• Improved test coverage in the code that checks for reserved IP address use. (#4462)

macOS Client

• Sorting by size now only uses the sizes of files that are wanted. (#4365)
• Fixed memory leak in the blocklist downloader. (#4309)
• Fixed UI issues in the main window when using Groups. (#4333)
• Improved layout of macOS UI elements. (#4366, #4367, #4460)
• Fixed the background style of torrents selected in the main window. (#4458)
• Updated code that had been using deprecated API. (#4308, #4441)
• Removed unused or unnecessary code. (#4374, #4440)
• Fixed 4.0.0-beta.1 regression that showed an incorrect icon or name in the drag overlay. (#4428)
• Fixed the file display of torrents that consist of just a single file in a single folder. (#4454)

Qt Client

• Fixed progress bars positioning on Mac. (#4489)
• Added Qt dependencies for Windows build instructions and minor fixes. (#4363)
• Updated Qt CMakeLists.txt to include support for building svg. (#4437)

GTK Client

• Fixed 4.0.0-beta.1 regression leading to potential crash on startup upon watch directory setup. (#4355)
• Fixed 4.0.0-beta.1 regression that prevented closing the «update blocklist» dialog. (#4391, #4392)
• Fixed a bug that hid the «Enable µTP for peer communication» checkbox. (#4349)
• Removed unused or unnecessary code. (#4416)

transmission-remote

• Fixed 4.0.0-beta.1 bug that showed the wrong ETA for some torrents. (#4506)

transmission-show

• Fixed 4.0.0-beta.2 regression that caused transmission-show --scrape to not exit cleanly. (#4447)

Everything Else

• Added Windows build manual. (#4291)
• Removed Visual C++ redistributable libraries installation from the MSI package. (#4339)
• Removed obsolete ‘lightweight’ build option. (#4509)

Thank You!

Last but certainly not least, a big Thank You to these people who contributed to this release:

Contributions to libtransmission (All Platforms):

• @stefantalpalaru (Ștefan Talpalaru):
  • Fixed 4.0.0-beta.2 regression that broke port forwarding in some settings. (#4343)
• @tinselcity (Reed Morrison):
  • Removed unused UTP Socket code. (#4409)

Contributions to macOS Client:

• @nevack (Dzmitry Neviadomski):
  • Code review for #4308, #4309, #4333, #4366, #4428, #4440, #4473
• @sweetppro (SweetPPro):
  • Code review for #4308, #4310, #4367, #4414, #4417, #4418, #4428, #4461
  • Fixed UI issues in the main window when using Groups. (#4333)
  • Improved layout of macOS UI elements. (#4366)
  • Removed unused or unnecessary code. (#4374)
  • Removed unused or unnecessary code. (#4440)
  • Refactor ActivityView. (#4448)
  • Fixed the background style of torrents selected in the main window. (#4458)
  • Improved layout of macOS UI elements. (#4460)

Contributions to Qt Client:

• @GaryElshaw (Gary Elshaw):
  • Updated Qt CMakeLists.txt to include support for building svg. (#4437)
• @smrtrfszm (Szepesi Tibor):
  • Added Qt dependencies for Windows build instructions and minor fixes. (#4363)

Contributions to transmission-remote:

• @lajp (Luukas Pörtfors):
  • Fixed 4.0.0-beta.1 bug that showed the wrong ETA for some torrents. (#4506)

Contributions to Everything Else:

• @dmantipov (Dmitry Antipov):
  • Refactor, ci: switch clang-format to LLVM 15. (#4297)
• @ile6695 (Ilkka Kallioniemi):
  • Code review for #4291
• @LaserEyess:
  • Code review for #4291
• @Petrprogs (Peter):
  • Added Windows build manual. (#4291)

Transmission 4.0.0-beta.2

What’s New in Transmission 4

• Support for using BitTorrent v2 torrents and hybrid torrents. (Support for creating v2 and hybrid torrents is slated for an upcoming release.)
• Users can now set «default» trackers that can be used to announce all public torrents.
• Newly-added seeds can start immediately and verify pieces on demand, instead of needing a full verify before seeding can begin. (#2626)
• Added an option to omit potentially-identifying information (e.g. User-Agent and date created) when creating new torrents. (#3452)
• The Web client has been rewritten and now supports mobile use.
• Added support for GTK 4. (#3916, GTK Client)
• When creating new torrents, users can now specify the piece size. (#3768, #3145, #2805)
• IPv6 blocklists are now supported. (#3835)

What’s New in 4.0.0-beta.2

Highlights

• Added support for GTK 4. (#3916, GTK Client)
• Prefer ayatana-indicator over appindicator, if present. (#4001, GTK Client)
• Lots of bugfixes!

libtransmission (All Platforms)

• Fixed 4.0.0-beta.1 regression that could misformat the port forwarding log messages. (#3911)
• Fixed 4.0.0-beta.1 regression that could crash when mixing IPv4 and IPv6 addresses in an IP blocklist. (#4011)
• Fixed 4.0.0-beta.1 regression that could fail to serve web client files from Windows. (#4099)
• Fixed 4.0.0-beta.1 bug that returned an incorrect key in group-get RPC responses. (#4171)
• Fixed data overflow in Message Log. (#4237)
• Fixed 4.0.0-beta.1 regression that broke the TR_TORRENT_LABELS environment variable when running user scripts. (#4260)
• Fixed slow shutdown caused by waiting on unresponsive trackers to reply. (#4285)
• Minor efficiency improvements in libtransmission. (#4116, #4216, #4220, #4224, #4226)
• Improved DHT bootstrapping on startup. (#4122)
• Made host lookups more efficient for users that disable CA verification. (#4159)
• Lowered CPU overhead in tr_peerIo::write() when writing to encrypted streams. (#4258)
• Improved detection of preinstalled system copies of libutp. (#4072)
• Use a newer version of fast_float as a fallback when no preinstalled version can be found on the system. (#4098)
• Updated libtransmission’s copy of the mime-types list. (#4246)

macOS Client

• Added the ability to sort by activity using the filter bar. (#3944)
• Fixed sort order when sorting by activity was reversed. (#3924)
• Fixed a potential hang when updating blocklists. (#4010)
• Fixed formatting of ETA dates for slow torrents. (#4085)
• Corrected the display in user locale of some quantities above 1000. (#4109)
• Fixed 4.0.0-beta.1 Inspector filter crash. (#4138)
• Fixed 4.0.0-beta.1 regression that could crash when displaying some torrents that contain invalid UTF-8. (#4144)
• Fixed 4.0.0-beta.1 UI glitch when users attempted to set piece size too high or too low. (#4145)
• Fixed missing 4.0.0-beta.1 translations. (#4161)
• Fixed a long-standing bug that could freeze the UI on startup while Time Machine was active. (#4208)
• Fixed deleting previously selected torrent when attempting to clear search field using ⌘⌫. (#4245)
• The ‘Transmission’ name has been removed from the Toolbar in Big Sur and later OS versions. (#3919)
• Improved sizing and alignment of the Message Log window. (#3962)
• Changed Badge display so that upload is up and download is down. (#4055)
• Auto enlarge search field. (#4067)
• Support UserNotifications framework. (#3040)
• Fixed various Xcode and CMake build issues. (#3940, #3946, #3951, #4156, #4185, #4195, #4231, #4234)
• Fixed macOS API deprecation warnings. (#3950, #4112, #4190, #4221)
• Fixed various macOS API warnings. (#4202)

GTK Client

• Added support for GTK 4. (#3916)
• Prefer ayatana-indicator over appindicator, if present. (#4001)
• Changed progress bar color depending on torrent state. (#3976)
• Fixed 4.0.0-beta.1 regression that could cause a crash after completing a download. (#3963)
• Fixed an issue where already open Details dialog didn’t update files list once magnet metainfo is retrieved. (#4004)
• Fixed 4.0.0-beta.1 regression that broke bulk-adding torrents from watchdirs. (#4079)
• Fixed broken ETA formatting in the 4.0.0-beta.1 Torrent Details dialog. (#4227)
• Fixed 4.0.0-beta.1 regression that made the About dialog difficult to close. (#3892)
• Fixed 4.0.0-beta.1 regression that made duplicate add/edit tracker error dialogs being shown twice. (#3898)
• Increased default Message Log window size to avoid toolbar controls being hidden on overflow. (#3971)
• Turned on more clang-tidy checks and fixed warnings. (#4127, #4137, #4158, #4160, #4167, #4174, #4183)
• Improved favicons lookup for unreachable tracker servers. (#4278)

Web Client

• Fix: chrome needs vendor prefix(-webkit-) for mask. (#4056)
• Improved layout of ‘Add Torrents’ dialog. (#4063)
• Improved inspector dialog styling on Chrome. (#4095)
• Refresh web interface across desktop and mobile. (#3985)
• Docs: refresh web-interface page. ([#427…

Welcome to the first beta release of Transmission 4.0.0! It’s been in active development for over a year and has a huge list of changes — over 1,000 commits — since Transmission 3.00. Some of the highlights include:

• Resource Efficiency — Use less memory, fewer CPU cycles
• Better Community — Pull requests welcomed and used
• Code Modernization — Rewritten in C++
• New Features — What would a major release be without them?

Resource Efficiency

• The code has been extensively profiled and improved to fix inefficient code and memory use. For example, a stress test of starting transmission-daemon with 25,000 torrents is almost entirely IO-bound, using 50% fewer CPU cycles and 70% fewer memory allocations than Transmission 3.00.

• The remote control GUIs (transmission-qt and transmission-web) now use the RPC API «table» mode, resulting in smaller payloads / less bandwidth use.

• RPC payloads are now compressed using libdeflate, a «heavily optimized [library that is] significantly faster than the zlib library.»

Community

• The project is much more responsive to bug reports and code submissions than it has been in the past.
• There is a new group of volunteer contributors who are working on Transmission!
• Transmission 4.0.0-beta.1 includes over 300 new community commits (see the Thank You section below for a list) and is welcoming new contributors.
• Documentation has been moved into the transmission/transmission so that contributors can submit PRs to improve it

Code Modernization

• The entire codebase has been migrated from C to C++. In the process, we’ve removed thousands of lines of custom code and used standard C++ tools instead. The core’s code has shrunk by 18%. The core codebase has extensively refactored to be more testable and maintainable.
• The GTK client has been ported to gtkmm.
• The Web client has been rewritten in modern JavaScript and no longer uses jQuery. The entire gzipped bundle is now 68K.
• The unit tests have been expanded and ported to Google Test. Clang sanitizer builds are run during CI.
• The core library is now fuzz tested.
• Transmission now uses Sonarcloud, Coverity, LGTM, and clang-tidy static analysis on new code. Several hundred code warnings have been fixed compared to Transmission 3.00.

New Features

• Support for using BitTorrent v2 torrents and hybrid torrents. (Support for creating v2 and hybrid torrents is slated for an upcoming release.)
• Users can now set «default» trackers that can be used to announce all public torrents.
• Newly-added seeds can start immediately and verify pieces on demand, instead of needing a full verify before seeding can begin. (#2626)
• Added an option to omit potentially-identifying information (e.g. User-Agent and date created) when creating new torrents. (#3452)
• The Web client has been rewritten and now supports mobile use.
• When creating new torrents, users can now specify the piece size. (#3768, #3145, #2805)
• IPv6 blocklists are now supported. (#3835)
• Beginning with 4.0.0-beta.1, Transmission releases now use semver versioning.
• Dozens of other new features — too many to list here! We’ve been working on this for a year!

Other Changes

[All Platforms] [macOS Client] [Qt Client] [GTK Client] [Daemon] [Web Client] [Utils] [Everything Else!]

All Platforms

• Fix small scrape/announce packet size that could trip SYN flood detection on some systems (#3236)
• Remove the 1024 open files limit previously required by how libcurl was used (#893)
• Add configurable anti-brute force settings (#1447)
• Fetch metadata of stopped magnets (#1080)
• Stop logging excessive error messages after they repeat too many times. In some cases, repetitive messages had been spamming syslogs. (#2756)

macOS Client

• Transmission is now a Universal (Apple Silicon and Intel) app.
• Refresh of the UI to better fit into modern macOS.
• A new icon designed for Big Sur by Rodger Werner.

Qt Client

• Support both Qt5 and Qt6 (#2069)
• Nicer error handling when duplicate torrents are added (#1410)
• More efficient use of RPC (#1234, #1322, #1333)
• More efficient state updates (#1334, #1335, #1336, #1428, #1430, #1432, #1433, #1234)
• Slightly more efficient RPC requests (#1373)
• Better caching of tracker favicons (#1402)
• Fix memory leaks (#1378)
• Fix FreeSpaceLabel crash (#1604)
• Add remote server version info in the About dialog (#1603)
• Support TR_RPC_VERBOSE environment variable for debugging RPC calls (#1435)
• Allow filtering by info hash (#1763)

GTK Client

• Ported to GTKMM
• When creating new torrents, their piece size can be specified.
• The File menu now incorporates normal quick key operations.
• The Details dialog now includes the date a torrent was added.
• The Details dialog now renders large file lists faster. (#2992, #2993)
• Better i18n of phrases for past, present, and future tense (#3214)

Daemon

TODO

Web Client

The web client has been given a major overhaul. (#1476)

User-visible highlights include:

• Mobile is now fully supported.
• Added fullscreen support on mobile.
• Better support for dark mode.
• Added mime icons to the torrent list.
• Improved theme consistency across the app.

Maintainer highlights include:

• Updated code to use ES6 APIs.
• No longer use jQuery UI.
• No longer use jQuery.
• Use Webpack to bundle the Javascript, CSS, and assets together — the entire bundle size is now 68K gzipped.
• Added eslint / prettier / stylelint tooling.
• Uses torrent-get’s ‘table’ mode for more efficient RPC calls.

Utils

• Allow webseed URLs when creating torrents in transmission-create
• Display more progress information during torrent creation in transmission-create (#1405)

Everything Else!

• https://transmissionbt.com/ has been redesigned! Thanks to @shatteredsite the redesign and to @Oleg-Chashko and @GaryElshaw for feedback!
• Roger Werner made a new Transmission icon!

Thank You

Last but certainly not least, a big Thank You to the people who contributed to this release: acchang, Ali, Andrey, Balázs Meskó, beizmos, Berbe, bexnoss, bkuhls, buckmelanoma, Carles Pastor Badosa, Charles Kerr, Chris Young, Chrool, Cœur, Colin B, Craig Andrews, C.W. Betts, Dachtire, Daniel Kamil Kozar, Dan Walters, David Beinder, David Miguel Susano Pinto, dependabot[bot], depler, Dinesh Manajipet, Dmitry Antipov, Dmitry Serov, Dmytro Lytovchenko, dubhater, Dzmitry Neviadomski, Esa Varemo, evils, ewtoombs, FallenWarrior2k, Federico Bond, FluxState, Frank Aurich, FX Coudert, Gary Elshaw, goldsteinn, Greg Hazel, Guido Cella, Guido Vranken, Hakjoon Sim, Han Shen, Harm133, Ilkka Kallioniemi, IMurzich, Isabella Skořepová, Jelle van der Waa, Johan, Jonas Malaco, JP-Ellis, kakuhen, Kirill Ovchinnikov, Kobaxidze256, Koro, L2501, LaserEyess, Lucas Clemente Vella, lucaxvi, Luukas Pörtfors, luzpaz, Mark Deepwell, Markus Amalthea Magnuson, Matan Ziv-Av, Matt Joiner, maxz, Max Zettlmeißl, Michael Lopez, Michal Kubiak, mickaelifs, Mike Gelfand, Mike Gilbert, Mitchell Livingston, Nathan Benichou, Nicholas Guriev, Noobsai, Norbert Papke, Oleg Chashko, orbital-mango, OscarCunningham, …

All Platforms

• Allow the RPC server to listen on an IPv6 address (#161)
• Change TR_CURL_SSL_VERIFY to TR_CURL_SSL_NO_VERIFY and enable verification by default (#334)
• Go back to using hash as base name for resume and torrent files (those stored in configuration directory) (#122)
• Handle «fields» argument in «session-get» RPC request; if «fields» array is present in arguments, only return session fields specified; otherwise return all the fields as before
• Limit the number of incorrect authentication attempts in embedded web server to 100 to prevent brute-force attacks (#371)
• Set idle seed limit range to 1..40320 (4 weeks tops) in all clients (#212)
• Add Peer ID for Xfplay, PicoTorrent, Free Download Manager, Folx, Baidu Netdisk torrent clients (#256, #285, #355, #363, #386)
• Announce INT64_MAX as size left if the value is unknown (helps with e.g. Amazon S3 trackers) (#250)
• Add TCP_FASTOPEN support (should result in slight speedup) (#184)
• Improve ToS handling on IPv6 connections (#128, #341, #360, #692, #737)
• Abort handshake if establishing DH shared secret fails (leads to crash) (#27)
• Don’t switch trackers while announcing (leads to crash) (#297)
• Improve completion scripts execution and error handling; add support for .cmd and .bat files on Windows (#405)
• Maintain a «session ID» file (in temporary directory) to better detect whether session is local or remote; return the ID as part of «session-get» response (TRAC-5348, #861)
• Change torrent location even if no data move is needed (#35)
• Support CIDR-notated blocklists (#230, #741)
• Update the resume file before running scripts (#825)
• Make multiscrape limits adaptive (#837)
• Add labels support to libtransmission and transmission-remote (#822)
• Parse session-id header case-insensitively (#765)
• Sanitize suspicious path components instead of rejecting them (#62, #294)
• Load CA certs from system store on Windows / OpenSSL (#446)
• Add support for mbedtls (formely polarssl) and wolfssl (formely cyassl), LibreSSL (#115, #116, #284, #486, #524, #570)
• Fix building against OpenSSL 1.1.0+ (#24)
• Fix quota support for uClibc-ng 1.0.18+ and DragonFly BSD (#42, #58, #312)
• Fix a number of memory leaks (magnet loading, session shutdown, bencoded data parsing) (#56)
• Bump miniupnpc version to 2.0.20170509 (#347)
• CMake-related improvements (Ninja generator, libappindicator, systemd, Solaris and macOS) (#72, #96, #117, #118, #133, #191)
• Switch to submodules to manage (most of) third-party dependencies
• Fail installation on Windows if UCRT is not installed

Mac Client

• Bump minimum macOS version to 10.10
• Dark Mode support (#644, #722, #757, #779, #788)
• Remove Growl support, notification center is always used (#387)
• Fix autoupdate on High Sierra and up by bumping the Sparkle version (#121, #600)
• Transition to ARC (#336)
• Use proper UTF-8 encoding (with macOS-specific normalization) when setting download/incomplete directory and completion script paths (#11)
• Fix uncaught exception when dragging multiple items between groups (#51)
• Add flat variants of status icons for message log (#134)
• Optimize image resources size (#304, #429)
• Update file icon when file name changes (#37)
• Update translations

GTK+ Client

• Add queue up/down hotkeys (#158)
• Modernize the .desktop file (#162)
• Add AppData file (#224)
• Add symbolic icon variant for the Gnome top bar and when the high contrast theme is in use (#414, #449)
• Update file icon when its name changes (#37)
• Switch from intltool to gettext for translations (#584, #647)
• Update translations, add new translations for Portuguese (Portugal)

Qt Client

• Bump minimum Qt version to 5.2
• Fix dropping .torrent files into main window on Windows (#269)
• Fix prepending of drive letter to various user-selected paths on Windows (#236, #307, #404, #437, #699, #723, #877)
• Fix sorting by progress in presence of magnet transfers (#234)
• Fix .torrent file trashing upon addition (#262)
• Add queue up/down hotkeys (#158)
• Reduce torrent properties (file tree) memory usage
• Display tooltips in torrent properties (file tree) in case the names don’t fit (#411)
• Improve UI look on hi-dpi displays (YMMV)
• Use session ID (if available) to check if session is local or not (#861)
• Use default (instead of system) locale to be more flexible (#130)
• Modernize the .desktop file (#162)
• Update translations, add new translations for Afrikaans, Catalan, Danish, Greek, Norwegian Bokmål, Slovenian

Daemon

• Use libsystemd instead of libsystemd-daemon (TRAC-5921)
• Harden transmission-daemon.service by disallowing privileges elevation (#795)
• Fix exit code to be zero when dumping settings (#487)

Web Client

• Fix tracker error XSS in inspector (CVE-?)
• Fix performance issues due to improper use of setInterval() for UI refresh (TRAC-6031)
• Fix recognition of https:// links in comments field (#41, #180)
• Fix torrent list style in Google Chrome 59+ (#384)
• Show ETA in compact view on non-mobile devices (#146)
• Show upload file button on mobile devices (#320, #431, #956)
• Add keyboard hotkeys for web interface (#351)
• Disable autocompletion in torrent URL field (#367)

Utils

• Prevent crash in transmission-show displaying torrents with invalid creation date (#609)
• Handle IPv6 RPC addresses in transmission-remote (#247)
• Add --unsorted option to transmission-show (#767)
• Widen the torrent-id column in transmission-remote for cleaner formatting (#840)

Code Signing Policy

• Windows MSI packages: free code signing provided by SignPath.io, certificate by SignPath Foundation

All Platforms

• Fix building against LibreSSL (#284, #486, #570)
• Fix building against mbedTLS (#115, #528)
• Fix torrents ETA calculation (#522)
• Fix cross-compilation issues caused by miniupnpc configuration test (#475)

Qt Client

• Fix bad downloaded percentage in DetailsDialog (#547)

Web Client

• Fix tracker error XSS in inspector (CVE pending; found by Rory McNamara of Gotham Digital Science)
• Fix torrent name HTML-escaping in trackers inspector tab

All Platforms

• Fix CVE-2018-5702 (#468)
• Fix crash on handshake if establishing DH shared secret fails (#27)
• Fix crash when switching to next tracker during announcement (#297)
• Fix potential issue during password salt extraction in OOM situation (#141)
• Workaround glib_DEFUN— and glib_REQUIRE-related configuration issue (#215)
• Fix building against OpenSSL 1.1.0+ (#24)

Mac Client

• Fix uncaught exception when dragging multiple items between groups (#51)
• Don’t hard-code libcrypto version to 0.9.8 in Xcode project (#71)

Mac Client

• Build OSX.KeRanger.A ransomware removal into the app

All Platforms

• Fix Makefile.am to include Windows patches into source archive
• Fix miniupnpc script to handle spaces and other special chars in paths

Mac Client

• Prevent crash during group rules removal in some cases
• Fix failure to remove seeding completion notifications from notification center
• Show main window and scroll to torrent on notification click
• Fix issue on Yosemite where peers view didn’t occupy all the available space when web seed view was hidden

Qt Client

• Fix existing running instance detection and torrents delegation when using DBus

Daemon

• Fix building on Windows x86
• Add --blocklist-update argument description to transmission-remote man page
• Use -rad as short form of --remove-and-delete option in transmission-remote

All Platforms

• Fix renaming torrent files with common prefix
• Fix some more thread safety bugs in the tr_list datatype
• Fix infinite loop when removing torrent data
• Add support for CyaSSL/WolfSSL and PolarSSL cryptographic backends; bump OpenSSL minimum to v0.9.7
• Initial CMake build system support
• Many improvements to support Windows builds with MSVS and MinGW; drop XP/2003 support, only Vista and up now
• Allow building against system UTP and DHT libraries
• Fix several memory leaks and buffer overflows
• Support miniupnpc API v14
• Fix «prefetch-enabled» value type in settings.json (boolean instead of integer)
• Fix some issues discovered by static analysis (cppcheck, coverity)
• Fix invalid JSON encoding for non-printable characters
• Fix multi-threaded locale use when encoding/decoding JSON data
• Fix encrypted communication with libevent 2.1+
• Prevent completed pieces modification by webseeds
• Require absolute paths in RPC requests
• Fix and unify torrent origin display in GTK+, Qt and web clients
• Fix crash on session shutdown (evdns_getaddrinfo_cancel)
• Retry if RPC server fails to bind to specified address
• Improve error checking on metadata retrieval
• Improve UTF-8 validity checking (merge changes from LLVM)
• Don’t build transmission-cli by default (it’s long deprecated)

Mac Client

• UI fixes for OS X 10.9+
• Trim potential URIs from clipboard
• Allow downloading files from http servers (not https) on OS X 10.11+
• Change Sparkle Update URL to use HTTPS instead of HTTP (addresses Sparkle vulnerability)
• Fix global options popover layout
• Fix building with Xcode 7+
• Drop OS X 10.6 support

GTK+ Client

• Fix overshoot and undershoot indicators display with GTK+ 3.16+ in main window
• Don’t require DISPLAY if started with --version argument

Qt Client

• Improve performance in Torrent Properties dialog for torrents with lots of files
• Prevent entering file renaming mode with mouse double-click
• Add context menu on files tab of Torrent Properties dialog resembling that of Mac client
• Remove torrent file from watch directory even if «show options dialog» is not set
• Use theme-provided icons in system tray and About dialog
• Fix initial watch directory scan
• Improve filter bar look and feel; lots of other small visual fixes; RTL layout fixes
• Show message to the user when duplicate torrent is being added
• Improve magnets handling in main window
• Display notifications via tray icon if D-Bus is not available
• Show notice on top of filtered torrents list; clear whole filter on notice double-click
• Add proper compiler flags to indicate C++11 use
• Fix translation files loading
• Add Chinese (China), German, Indonesian, Italian (Italy), Korean, Polish (Poland), Ukrainian translations; update existing translations

Daemon

• Run as service on Windows when in background mode
• Rework directory watching, add support for native mechanisms on BSD/Darwin (kqueue) and Windows (ReadDirectoryChanges)
• Don’t make assumptions of remote path validity in transmission-remote

Web Client

• Content Security Policy enhancements
• Enable «resume now» for queued torrents
• Mark appropriate fields in preferences dialog as HTML5 number fields
• Update to jQuery 1.11.2, jQueryUI 1.11.4; use jQueryUI menus instead of custom ones

All Platforms

• Fix peer communication vulnerability (no known exploits) reported by Ben Hawkes