BREAKING CHANGES
* 32-bit windows builds are no longer provided.
* **build deps**: use libuv 1.42.0 upstream for WIN32 (#15889) (f6c0a37), closes#15889
* removes Windows 7 support
* removes support for mouse and alternate buffers in TUI for Windows 8 and 8.1
* **lsp/diagnostic:** highlight groups and signs for LSP diagnostics renamed (e.g. `LspDiagnosticsDefaultWarning` to `DiagnosticWarn`) (a5bbb93)
* **diagnostic:** make DiagnosticChanged a first class autocmd (#16098) (150a592), closes#16098
* `au User LspDiagnosticsChanged` autocommands are not supported. Use the new first-class DiagnosticChanged event instead.
* **lua**: `register_keystroke_callback` => `on_key` (#15460) (69fe427)
* **note**: this breaking change was included in 0.5.1
FEATURES
* **:source, nvim_exec:** defer script item creation until s:var access (da9b0ab)
* **:source, nvim_exec:** support script-local variables (d4ed51e), closes#13143#11507
* **lua:** add trimempty optional parameter to vim.split (5fa26e2)
* **lua:** add vim.str_utf_{start,end} (#16129) (2230b57)
* **lua:** add vim.str_utf_pos function (d752cbc)
* **lsp:** aggregate code actions from all clients (#15121) (c36df20)
* **api:** add lua C bindings for xdiff (#14536) (3d3c0c6)
* **api:** evaluate statusline string #16020 (9086938)
* **api:** named marks set, get, delete #15346 (49fdc62)
* **api:** nvim_get_chan_info: include "argv" for jobs #15537 (0603eba), closes#15440
* **api:** win_viewport also sends line_count #15613 (086631c)
* **api:** support :terminal input callback in lua (9e41e82)
* **ci:** add backport PR action (#14766) (6cc456d)
* **decorations:** allow more than one stacked highlight in a virt_text (1495d36)
* **decorations:** support virtual lines (392c658) (8d7816c)
* **diagnostic:** move vim.lsp.diagnostic to vim.diagostic and support other sources (a5bbb93)
* **diagnostic:** add 'prefix' option to open_float (#16321) (3c74ba4)
* **diagnostic:** add option to include diagnostic source (d43151e)
* **diagnostic:** allow 'prefix' option to return highlight (cc48837)
* **diagnostic:** allow customized diagnostic messages (#15742) (d999c96)
* **diagnostic:** match(), tolist(), fromlist() #15704 (e61ea77)
* **diagnostic:** update jumplist on goto_next/prev (#15942) (b55944e)
* **diagnostic:** use `scope = 'line'` by default for `open_float()` (#16456) (217f9f8), closes#16453
* **diagnostic:** support severity_sort (32c0631)
* **checkhealth:** provide function for command line completion (8b43b07)
* **f_chansend:** support Blob data argument (7e9ea08)
* **job:** add parameter to close stdin (eb7f24b)
* **keywordprg:** use :terminal for external commands #15398 (a90513c), closes#2995#2761
* **lsp:** add 'focus' option to open_floating_preview (#16465) (fff8827)
* **lsp:** add a registry for client side code action commands (6c03601)
* **lsp:** add client command support to codelens (#15820) (19a77cd)
* **lsp:** add codeAction/resolve support (#15818) (ec4731d)
* **lsp:** add exit_timeout flag (#16070) (80456cf)
* **lsp:** add formatexpr (#16186) (52fa1d2)
* **lsp:** add lsp healthcheck (e268026)
* **lsp:** add per-client commands (#16101) (519d8de)
* **lsp:** add tagfunc (#16103) (f940e7a)
* **lsp:** add warning message for large log size (e6777a7)
* **lsp:** allow configuring zindex for floating windows (#15086) (c487a73)
* **lsp:** allow diagnostics to be disabled for a buffer (#15134) (1aeb945)
* **lsp:** allow root_dir to be nil (#15430) (ff0833c)
* **lsp:** highlight active parameter in signature help (#15018) (af26371)
* **lsp:** improve vim.lsp.util.apply_text_edits (#15561) (41cfba6)
* **lsp:** include original request params in handler ctx (187579f)
* **lsp:** jump to diagnostics by position (#14795) (ea39ff5)
* **lsp:** Make line diagnostics display prettier (e43dbfd)
* **lsp:** make list handlers configurable (#15199) (3e00d4f)
* **lsp:** support textDocument/prepareRename (#15514) (c1f573f)
* **lsp:** use uv_spawn to check if server executable (#16430) (1a60580)
* **lsp:** use vim.ui.select() in codelenses (#16004) (e7ea54a)
* **lsp:** utilize textEdit.range for startbyte in omnifunc (#15957) (e9d6f7c)
* **lua:** add lua-cjson as vendored dependency (8decc9f)
* **lua:** add vim.mpack for msgpack support in lua (eaf661d)
* **lua:** allow passing handles to vim.b/w/t (6c5e7bd)
* **lua:** convert binary string with NULs to Blob (de9df82)
* **lua:** document support of packages with v:lua syntax (9dd371b)
* **lua:** enable stack traces in error output (#16228) (03b805a)
* **lua:** expose lua-cjson as vim.json (30fed27)
* **lua:** make vim.mpack support vim.NIL and vim.empty_dict() (0f59666)
* **match:** allow hl group to be defined after :match command (fca52f5)
* **msgpack:** convert Blobs to BIN strings (af6f454)
* **health:** support lua healthchecks (9249dcd), closes#15632
* **shada:** restore Blob globals properly (ef729fb)
* **terminal:** TermClose: set exit code in v:event.status #15406 (50b30de), closes#4713
* **treesitter:** add next, prev sibling method (1400841)
* **treesitter:** allow to set highlight priority for queries (242608e)
* **ui:** add `opt.kind` to `vim.ui.select` (#15838) (7ae86c1)
* **ui:** add vim.ui.input and use in lsp rename (#15959) (16d4af6)
* **ui:** add vim.ui.select and use in code actions (#15771) (63fde08)
* **vim script:** support calling v:lua as a method (b2994e3)
CHANGES
* **defaults:** auto-create backup dir (4600193)
* **defaults:** inccommand=nosplit #15395 (7215d35)
* **defaults:** set undo points in <C-U> and <C-W> (#15400) (2cb8db3)
* **defaults:** limit syntax cost on CmdwinEnter #15401 (622a36b), closes#6289#6399
* **defaults:** map CTRL-L to search highlights, update diffs #15385 (0aa8128)
* **defaults:** map Y to y$ #13268 (5a111c1), closes#416#6289
* **defaults:** remove 'options' from viewoptions #15397 (3954537), closes#6289
* **defaults:** set hidden (f6c72b7)
* **defaults:** set nojoinspaces (d417e67)
* **defaults:** switchbuf=uselast #15394 (4ba7495)
* **runtime:** add packages as `"/pack/*/start/*"` patterns to &rtp (9df7e02)
* **startup:** load builtin plugins with --clean #15893 (c7a63f3), closes#15605
* **terminal:** set cursorlineopt=number in terminal mode (#15493) (c61a386)
* **window:** skip non-focusable floats for :windo (#15378) (e8631cb)
PERFORMANCE IMPROVEMENTS
* **api:** avoid spurious allocations when converting small objects (705e8f1)
* **highlight:** use a hashtable for highlight group names (bb4b4d7)
* **lua:** optimize vim.deep_equal #15236 (4b452d4)
* **lua:** don't use regexes inside lua require'mod' (ea2023f), closes#15147#15497
* **lsp:** improve json deserialization performance (#15854) (912a6e5)
* **map:** reduce double pointer indirection to single pointer indirection (9e651a9)
* **treesitter:** avoid string lookup of highlight name in hot loop (2460f0a)
FIXES
* **:source, nvim_exec:** handle Vimscript line continuations #14809 (6188926), closes#14807
* **:source:** copy curbuf lines to memory before sourcing #15111 (afdc9e6)
* allow str_utfindex second argument to be an explicit nil (#16448) (512ec46)
* **api:** fix crash after set_option_value_for() #15390 (8b0e6cc), closes#14097#13577
* **api:** fix nvim_buf_set_extmark (2338345)
* **autocmd:** fix conditions in block_autocmds, unblock_autocmds #15372 (29712ae), closes#6279
* **buffer_updates:** cleanup test behavior (54b2c68)
* **buffer_updates:** handle :delete of the very last line in buffer (8335e26)
* **buffer_updates:** handle :sort of already sorted buffer (ef687d3)
* **buffer_updates:** make `lockmarks` not affect extmarks and buffer updates. fixes#12861 (7d171b1)
* **bufupdates:** send correct updates for visual paste (1423146)
* **build:** add an env var to re-enable the colors (5087347)
* **build:** call find_package(Threads) before using its variables (f446ab3)
* **build:** export symbols on Windows (aa644b7)
* **build:** fix build failure in MinGW (0503e17)
* **build:** make vendored libmpack and libmpack-lua build properly (2a08aef)
* **channel:** throw error if sending to internal channel w/o terminal (3b89fee)
* **checkhealth:** duplicate checks if module name has "-" #15935 (a36c6e5)
* **checkhealth:** mitigate issues with duplicate healthchecks #15919 (acd5e83), closes#15259
* **ci:** disable broken test on openbsd on all CI due to resource constraints (a3e2636)
* **ci:** re-run GHA for ready_for_review events (#15377) (c6ef956)
* **decorations:** crash when :bdelete (extmark_free_all) after clear_namespace (cd353aa), closes#15212
* **defaults:** "syntax sync maxlines=1" on CmdwinEnter #15552 (5f8518b), closes#15401
* **defaults:** do not map Y in visual-mode #15387 (54726e8), closes#13268
* **diagnostic:** allow floats to be focusable (#16093) (427bac6)
* **diagnostic:** change default severity_sort order (938ed45)
* **diagnostic:** clamp line numbers in setqflist and setloclist (5b0d8f8)
* **diagnostic:** correctly handle folder level diagnostics (f87779a)
* **diagnostic:** deepcopy diagnostics before clamping line numbers (2abc799)
* **diagnostic:** do not focus floats in goto functions (#16433) (b5b025f)
* **diagnostic:** don't clamp line numbers in setqflist (0341c68)
* **diagnostic:** don't return nil when callers expect a table (#15765) (057606e)
* **diagnostic:** don't use nil col if missing from qflist (#16357) (5e46f64)
* **diagnostic:** error on invalid severity value (#15965) (d5dd0aa)
* **diagnostic:** fix navigation with diagnostics placed past end of line (34bb5fa)
* **diagnostic:** fix option resolution in open_float (#16229) (fd34784)
* **diagnostic:** fix wrong data type in setqflist() (3fd1450)
* **diagnostic:** get line count per buffer when clamping (c59f200)
* **diagnostic:** handle an unknown or missing client (#16242) (1fdbd29)
* **diagnostic:** handle diagnostics placed past the end of line (#16095) (a2994c8)
* **diagnostic:** make set() go through cache when calling show() (d93f47d)
* **diagnostic:** only update decorations for loaded buffers (#15715) (924e8e4)
* **diagnostic:** preserve fields from LSP diagnostics via user_data (#15735) (17b7968)
* **diagnostic:** remove useless highlight links (#15683) (c13242c), closes#15585
* disable clipboard when test registers (dd63d93)
* **docgen:** add tagfunc.lua (0746f00)
* **doc:** various fixes#15604 (4eb1ebb)
* **eval:** add the vimscript-1 feature to has() (18b32fc)
* **eval:** checking for a non-empty string is too strict (#15987) (1dbbaf8)
* **eval:** fix has('wsl') #16153 (16d06fa), closes#12642#16143
* **eval:** fixup for empty modifier in fnamemodify (#16368) (a7ad509), closes#16367
* **extmark:** fix missing virt_lines when using id param of set_extmark (995dbd2)
* **extmarks:** splice extmarks on nv_Undo #15920 (e069361)
* **fileio:** replace characters over INT_MAX with U+FFFD (#16354) (a2e5c2f), closes#11877
* **float:** fix potential heap corruption in win_redr_border (de670f3)
* **float:** redraw if w_border_adj changed (7ff1bc1)
* **heath/provider.vim:** using list as string #16007 (5365f24), closes#15988
* **highlight:** remove syncolor.vim, always include syntax colors (9afa0d2), closes#15176#12573#15205
* **inccommand:** ignore trailing commands only for *previewed* command #15638 (1f8c91b), closes#8796#7494
* include ci/ in exported tarball (d6f03aa), closes#15856
* **input:** never reinterpret unmapped ALT- chrods in Terminal mode (#16222) (5ce35ab)
* **input:** resolve isolated (non-ALT/META) mappings #13109 (c4857b6), closes#13042#13086#15869
* **jobwait:** always drain process event queues #15402 (3c081d0), closes#15349
* **lsp_spec:** tests depended on previous session (069d1de)
* **lsp:** accept file URIs without a hostname (a2c2a08)
* **lsp:** add done flag to messages returned in util.get_progress_messages() (#15985) (45fa70a)
* **lsp:** add placeholder cancel function (#16189) (4da0351)
* **lsp:** add textDocument/prepareRename to capability map (#15961) (fcc11d5), closes#15899
* **lsp:** adjust legacy show diagnostic functions to use correct scope (#16106) (dc6c9fe)
* **lsp:** allow diagnostic.clear to accept nil bufnr (#15137) (4ed2d4f)
* **lsp:** avoid duplicates in client attached buffers (#16099) (c5525f2)
* **lsp:** avoid serializing boolean as key (#15810) (96614f8)
* **lsp:** change rpc start notify level to warn (#16467) (04c7b55)
* **lsp:** change signature of buf_highlight_references (#16345) (eb3d591)
* **lsp:** correctly parse LSP snippets #15579 (516775e), closes#15522
* **lsp:** default to UTF-16 in make_position_params (2e3a474)
* **lsp:** do not index nil client in progress (#16262) (8f31b21)
* **lsp:** do not invoke handlers for unsupported methods (#15926) (d288daa)
* **lsp:** don't update active_clients on exit_timeout (#16192) (98f5782)
* **lsp:** enable additional capabilities (#15470) (5d63354)
* **lsp:** ensure buffers are re-attached on rename (#16266) (ee3a58d)
* **lsp:** Ensure users get feedback on references/symbols errors or empty results (256570a)
* **lsp:** expose ContentModified error code to callbacks (#15262) (3f09732)
* **lsp:** fix cursor row after textEdits (#16038) (bd2f61c)
* **lsp:** gracefully handle nil workspaceFolders (#16284) (0ecc58c)
* **lsp:** guard textDocument/codeAction command logic #15769 (433bda4)
* **lsp:** improve symbols_to_items performance (#16197) (5ad15c9)
* **lsp:** Include client name in handler error messages (#15227) (24f2b9e)
* **lsp:** pass bufnr for async formatting (#15084) (c31bc6e)
* **lsp:** persist diagnostic config for clients (bcc9ba5)
* **lsp:** prevent double <text> for cached plaintext markup (910967e)
* **lsp:** restore diagnostics extmarks on buffer changes (#15011) (77b33e4)
* **lsp:** rewrite incremental sync (#16252) (2ecf0a4)
* **lsp:** send buffer contents joined on fileformat-specific linebreak (#16334) (134a638)
* **lsp:** send textDocument/didChange for each buffer (#16431) (3451121)
* **lsp:** support duplicate params in signature help (#15032) (9132b76)
* **lsp:** update lsp-handler signature in call_hierarchy (#15738) (8164adc)
* **lsp:** update workspace/applyEdit handler signature (#15573) (3f526fe)
* **lua:** fix vim.deepcopy for metatables & cycled tables (#16435) (eb876a0)
* **lua:** preserve argument lists which are not lists (6896d22)
* **man.vim:** ensure buftype=nofile after :tag or :stag #15675 (29bc648), closes#15650
* **man.vim:** filetype=man is too eager #15488 (2548a9e), closes#15487#15487
* **mouse:** fix mouse drag positions on multigrid #12667 (0dcfd0e), closes#15091
* **mouse:** correct dragged position in composed layout (810da1a)
* **multigrid:** mouse events crash neovim (28ac6c0)
* **nvim_open_win:** crash if autocmds delete buffer/window #15549 (0c06da1), closes#15548
* **options:** using :set fillchars should clear local value (7528bce)
* prevent K_EVENT from stopping Select mode CTRL-O #15688 (5f144ef)
* **provider:** compare versions as number, not string (python 3.10 support) #15937 (e16adbf), closes#14586
* **screen:** make display_tick monotonic up to 2^64. fixes#16152 (9e88c9c)
* **screen:** missing search highlights when redrawing from timer #15380 (db695cc), closes#13074#14064
* **shared:** do not treat empty tables as list in deep extend (#15094) (526fc60)
* **sign:** reset auto sign column with minimum in float win minimal style (c8f57f6)
* **startup:** init.lua: set $MYVIMRC to absolute path #15748 (c76cddf)
* **termdebug:** replace mapset with nvim_set_keymap (#15699) (4d7dcbe)
* **termdebug:** replace term_getline with getbufline #15598 (11289ad)
* **terminal:** close without ! if the job is stopped (55defa1), closes#4683
* **terminal:** free terminal if close_buffer() closes a closed terminal (#16264) (14def4d)
* **test/dumplog:** tostring(rv) before formatting as string (ddaa0cc)
* **tests:** use isolated XDG_DATA_HOME in startup tests (8e663e2)
* **treesitter:** do not map hl_group when no mapping is set (f489d98)
* **treesitter:** run predicates more often in iter_matches (458f2aa)
* **tui:** extend smglr ignores to smglp and smgrp (#16239) (3ba800f)
* **tui:** remove obsolete $NVIM detection #15791 (4414584), closes#12937#11390
* **tutor:** formatting, layout #15098 (c52ec8f), closes#15088
* **ui:** use nowait for q mapping in floating window (#16427) (c132144)
* **v:lua:** fix emsg when calling v:lua directly (da9005a)
* **vim-patch.sh:** run nvim with -u NONE -n #16179 (97ae0ab)
* **vim.opt:** vimL map string values not trimmed (#14982) (4906156)
* **window:** win_close from other tabpage #15454 (90b2da1), closes#15313
* **windowing:** positioning of relative floats (9065730)
- Configuring the translation domain allows calculating and showing the translation states of each language
- OARS gives Neovim a nice ‘safe for children’ badge
- Releases allow displaying release info/update frequency
