Major changes in 2.1

• Devices and folders can now be grouped in the GUI by setting the new group attribute.
• HTTP and HTTPS proxies with support for CONNECT can now be used, in addition to the existing support for SOCKS proxies (the environment variable all_proxy=https://...).
• Block indexing can be turned off for folders where it's more desirable to optimise for reduced database size and overhead than minimal transfer size (the blockIndexing attribute on folder configuration).
• GUI login session duration can be configured to be longer or shorter than the default one week, or set to infinitely long. The cookie path can also be adjusted. (The sessionCookieDurationS and sessionCookiePath attributes in the GUI configuration.) This release is also available as:
• APT repository: https://apt.syncthing.net/
• Docker image: docker.io/syncthing/syncthing:2.1.2 or ghcr.io/syncthing/syncthing:2.1.2 ({docker,ghcr}.io/syncthing/syncthing:2 to follow just the major version)

What's Changed

Fixes

• fix: on Windows don't allocate console if not opened inside one by @Shablone in #10726
• fix(connections): do not report connection metrics for self (ref #10509) by @calmh in #10724
• fix: let umask do the thing by @calmh in #10723
• fix(fs, model): improve symlink resilience in file shortcut by @calmh in #10739
• fix(protocol): always expect & validate block hash in requests by @calmh in #10738
• fix(protocol): be more stringent about blocks in non-file entries by @calmh in #10737
• fix(protocol): loosen restriction on size of directory entries by @calmh in #10743
• fix(folder): check if context canceled when scanning (fixes #10363) by @henriksb1 in #10757
• fix(config): remove extraneous defaults setting while unmarshalling folder options (fixes #10746, fixes #10389) by @calmh in #10763
• fix(sqlite): update last migration to set schema version, counts by @calmh in #10768

Other

• chore(syncthing): open URLs via Windows API instead via cmd.exe by @Shablone in #10712
• chore(db, model): separate methods to drop a device vs its files by @imsodin in #10480
• build(deps): update dependencies by @calmh in #10740
• build: use Go 1.26 for Windows as well by @calmh in #10744
• chore(osutil): fixup test for symlinked folder root by @calmh in #10758
• chore(model): increase default value for num hashers by @calmh in #10761
• chore: stop treating dirs as having size 128 by @imsodin in #10750
• chore(versioner): attempt to prevent blatantly unsafe external versioner commands (fixes #10721) by @calmh in #10722

New Contributors

• @Shablone made their first contribution in #10712
• @henriksb1 made their first contribution in #10757