patch 9.1.1638: completion: not possible to delay the autcompletion

Commit: 
https://github.com/vim/vim/commit/a09b1604d4fe7516d87fbcbf2ffd2dc484799b23
Author: Girish Palya <giris...@gmail.com>
Date:   Sat Aug 16 18:04:04 2025 +0200

    patch 9.1.1638: completion: not possible to delay the autcompletion
    
    Problem:  completion: not possible to delay the autcompletion
    Solution: add the 'autocompletedelay' option value (Girish Palya).
    
    This patch introduces a new global option 'autocompletedelay'/'acl' that
    specifies the delay, in milliseconds, before the autocomplete menu
    appears after typing.
    
    When set to a non-zero value, Vim waits for the specified time before
    showing the completion popup, allowing users to reduce distraction from
    rapid suggestion pop-ups or to fine-tune the responsiveness of
    completion.
    
    The default value is 0, which preserves the current immediate-popup
    behavior.
    
    closes: #17960
    
    Signed-off-by: Girish Palya <giris...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/insert.txt b/runtime/doc/insert.txt
index a56ffc0d3..d017042c8 100644
--- a/runtime/doc/insert.txt
+++ b/runtime/doc/insert.txt
@@ -1,4 +1,4 @@
-*insert.txt*    For Vim version 9.1.  Last change: 2025 Aug 06
+*insert.txt*    For Vim version 9.1.  Last change: 2025 Aug 16
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1138,8 +1138,8 @@ CTRL-X CTRL-Z             Stop completion without 
changing the text.
 AUTOCOMPLETION                                         *ins-autocompletion*
 
 Vim can display a completion menu as you type, similar to using |i_CTRL-N|,
-but triggered automatically.  See 'autocomplete'. The menu items are collected
-from the sources listed in the 'complete' option.
+but triggered automatically.  See 'autocomplete' and 'autocompletedelay'.
+The menu items are collected from the sources listed in the 'complete' option.
 
 Unlike manual |i_CTRL-N| completion, this mode uses a decaying timeout to keep
 Vim responsive.  Sources earlier in the 'complete' list are given more time
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index b22a1711d..74fddabbf 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*  For Vim version 9.1.  Last change: 2025 Aug 07
+*options.txt*  For Vim version 9.1.  Last change: 2025 Aug 16
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -918,6 +918,13 @@ A jump table for the options with a short description can 
be found at |Q_op|.
        When on, Vim shows a completion menu as you type, similar to using
        |i_CTRL-N|, but triggered automatically.  See |ins-autocompletion|.
 
+                                       *'autocompletedelay'* *'acl'*
+'autocompletedelay' 'acl'      number  (default 0)
+                               global
+       Delay in milliseconds before the autocomplete menu appears after
+       typing. If you prefer it not to open too quickly, set this value
+       slightly above your typing speed. See |ins-autocompletion|.
+
                        *'autoindent'* *'ai'* *'noautoindent'* *'noai'*
 'autoindent' 'ai'      boolean (default off)
                        local to buffer
diff --git a/runtime/doc/quickref.txt b/runtime/doc/quickref.txt
index 0a5bcc970..4dbef3b76 100644
--- a/runtime/doc/quickref.txt
+++ b/runtime/doc/quickref.txt
@@ -1,4 +1,4 @@
-*quickref.txt*  For Vim version 9.1.  Last change: 2025 Aug 06
+*quickref.txt*  For Vim version 9.1.  Last change: 2025 Aug 16
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -608,6 +608,7 @@ Short explanation of each option:           *option-list*
 'arabicshape'    'arshape' do shaping for Arabic characters
 'autochdir'      'acd'     change directory to the file in the current window
 'autocomplete'   'ac'      enable automatic completion in insert mode
+'autocompletedelay' 'acl'   delay in msec before menu appears after typing
 'autoindent'     'ai'      take indent for new line from previous line
 'autoread'       'ar'      autom. read file when changed outside of Vim
 'autoshelldir'   'asd'     change directory to the shell's current directory
diff --git a/runtime/doc/tags b/runtime/doc/tags
index d94bc5ba9..9a0f8f2cf 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -43,6 +43,7 @@ $quote        eval.txt        /*$quote*
 'a     motion.txt      /*'a*
 'ac'   options.txt     /*'ac'*
 'acd'  options.txt     /*'acd'*
+'acl'  options.txt     /*'acl'*
 'ai'   options.txt     /*'ai'*
 'akm'  options.txt     /*'akm'*
 'al'   options.txt     /*'al'*
@@ -64,6 +65,7 @@ $quote        eval.txt        /*$quote*
 'asd'  options.txt     /*'asd'*
 'autochdir'    options.txt     /*'autochdir'*
 'autocomplete' options.txt     /*'autocomplete'*
+'autocompletedelay'    options.txt     /*'autocompletedelay'*
 'autoindent'   options.txt     /*'autoindent'*
 'autoprint'    vi_diff.txt     /*'autoprint'*
 'autoread'     options.txt     /*'autoread'*
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 281ae2d51..aa7a57ded 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -41815,6 +41815,7 @@ Ex-Commands: ~
 Options: ~
 
 'autocompletion'       Enable auto completion |ins-autocompletion|
+'autocompletedelay'    Delay in msec before menu appears after typing
 'chistory'             Size of the quickfix stack |quickfix-stack|.
 'completefuzzycollect' Enable fuzzy collection of candidates for (some)
                        |ins-completion| modes
diff --git a/runtime/optwin.vim b/runtime/optwin.vim
index 26c80e5ce..dc6aae08f 100644
--- a/runtime/optwin.vim
+++ b/runtime/optwin.vim
@@ -1,7 +1,7 @@
 " These commands create the option window.
 "
 " Maintainer:  The Vim Project <https://github.com/vim/vim>
-" Last Change: 2025 Aug 07
+" Last Change: 2025 Aug 16
 " Former Maintainer:   Bram Moolenaar <b...@vim.org>
 
 " If there already is an option window, jump to that one.
@@ -876,6 +876,8 @@ if has("insert_expand")
   call <SID>OptionL("cpt")
   call <SID>AddOption("autocomplete", gettext("automatic completion in insert 
mode"))
   call <SID>BinOptionG("ac", &ac)
+  call <SID>AddOption("autocompletedelay", gettext("delay in msec before menu 
appears after typing"))
+  call append("$", "   set acl=" . &acl)
   call <SID>AddOption("completeopt", gettext("whether to use a popup menu for 
Insert mode completion"))
   call <SID>OptionL("cot")
   call <SID>AddOption("completeitemalign", gettext("popup menu item align 
order"))
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index a28aa77af..cf7f1a43a 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -2,7 +2,7 @@
 " Language:       Vim script
 " Maintainer:     Hirohito Higashi <h.east.727 ATMARK gmail.com>
 "         Doug Kearns <dougkea...@gmail.com>
-" Last Change:    2025 Aug 01
+" Last Change:    2025 Aug 16
 " Former Maintainer: Charles E. Campbell
 
 " DO NOT CHANGE DIRECTLY.
@@ -63,11 +63,11 @@ syn keyword vimStdPlugin contained  Arguments Asm Break 
Cfilter Clear Continue Di
 
 " vimOptions are caught only when contained in a vimSet {{{2
 " GEN_SYN_VIM: vimOption normal, START_STR='syn keyword vimOption contained', 
END_STR='skipwhite nextgroup=vimSetEqual,vimSetMod'
-syn keyword vimOption contained al aleph ari allowrevins ambw ambiwidth arab 
arabic arshape arabicshape acd autochdir ac autocomplete ai autoindent ar 
autoread asd autoshelldir aw autowrite awa autowriteall bg background bs 
backspace bk backup bkc backupcopy bdir backupdir bex backupext bsk backupskip 
bdlay balloondelay beval ballooneval bevalterm balloonevalterm bexpr 
balloonexpr bo belloff bin binary bomb brk breakat bri breakindent briopt 
breakindentopt bsdir browsedir bh bufhidden bl buflisted bt buftype cmp casemap 
cdh cdhome cd cdpath cedit ccv charconvert chi chistory cin cindent cink 
cinkeys cino cinoptions cinsd cinscopedecls cinw cinwords cb clipboard cpm 
clipmethod ch cmdheight cwh cmdwinheight cc colorcolumn co columns com comments 
cms commentstring skipwhite nextgroup=vimSetEqual,vimSetMod
-syn keyword vimOption contained cp compatible cpt complete cfu completefunc 
cfc completefuzzycollect cia completeitemalign cot completeopt cpp 
completepopup csl completeslash cocu concealcursor cole conceallevel cf confirm 
ci copyindent cpo cpoptions cm cryptmethod cspc cscopepathcomp csprg cscopeprg 
csqf cscopequickfix csre cscoperelative cst cscopetag csto cscopetagorder 
csverb cscopeverbose crb cursorbind cuc cursorcolumn cul cursorline culopt 
cursorlineopt debug def define deco delcombine dict dictionary diff dia 
diffanchors dex diffexpr dip diffopt dg digraph dir directory dy display ead 
eadirection ed edcompatible emo emoji enc encoding eof endoffile eol endofline 
ea equalalways ep equalprg eb errorbells ef errorfile efm errorformat ek 
esckeys ei eventignore skipwhite nextgroup=vimSetEqual,vimSetMod
-syn keyword vimOption contained eiw eventignorewin et expandtab ex exrc fenc 
fileencoding fencs fileencodings ff fileformat ffs fileformats fic 
fileignorecase ft filetype fcs fillchars ffu findfunc fixeol fixendofline fcl 
foldclose fdc foldcolumn fen foldenable fde foldexpr fdi foldignore fdl 
foldlevel fdls foldlevelstart fmr foldmarker fdm foldmethod fml foldminlines 
fdn foldnestmax fdo foldopen fdt foldtext fex formatexpr flp formatlistpat fo 
formatoptions fp formatprg fs fsync gd gdefault gfm grepformat gp grepprg gcr 
guicursor gfn guifont gfs guifontset gfw guifontwide ghr guiheadroom gli 
guiligatures go guioptions guipty gtl guitablabel gtt guitabtooltip hf helpfile 
hh helpheight hlg helplang hid hidden hl highlight hi history hk hkmap hkp 
hkmapp hls hlsearch skipwhite nextgroup=vimSetEqual,vimSetMod
-syn keyword vimOption contained icon iconstring ic ignorecase imaf 
imactivatefunc imak imactivatekey imc imcmdline imd imdisable imi iminsert ims 
imsearch imsf imstatusfunc imst imstyle inc include inex includeexpr is 
incsearch inde indentexpr indk indentkeys inf infercase im insertmode ise 
isexpand isf isfname isi isident isk iskeyword isp isprint js joinspaces jop 
jumpoptions key kmp keymap km keymodel kpc keyprotocol kp keywordprg lmap 
langmap lm langmenu lnr langnoremap lrm langremap ls laststatus lz lazyredraw 
lhi lhistory lbr linebreak lines lsp linespace lisp lop lispoptions lw 
lispwords list lcs listchars lpl loadplugins luadll magic mef makeef menc 
makeencoding mp makeprg mps matchpairs mat matchtime mco maxcombine mfd 
maxfuncdepth mmd maxmapdepth mm maxmem skipwhite nextgroup=vimSetEqual,vimSetMod
-syn keyword vimOption contained mmp maxmempattern mmt maxmemtot msc 
maxsearchcount mis menuitems mopt messagesopt msm mkspellmem ml modeline mle 
modelineexpr mls modelines ma modifiable mod modified more mouse mousef 
mousefocus mh mousehide mousem mousemodel mousemev mousemoveevent mouses 
mouseshape mouset mousetime mzq mzquantum mzschemedll mzschemegcdll nf 
nrformats nu number nuw numberwidth ofu omnifunc odev opendevice opfunc 
operatorfunc pp packpath para paragraphs paste pt pastetoggle pex patchexpr pm 
patchmode pa path perldll pi preserveindent pvh previewheight pvp previewpopup 
pvw previewwindow pdev printdevice penc printencoding pexpr printexpr pfn 
printfont pheader printheader pmbcs printmbcharset pmbfn printmbfont popt 
printoptions prompt ph pumheight skipwhite nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained al aleph ari allowrevins ambw ambiwidth arab 
arabic arshape arabicshape acd autochdir ac autocomplete acl autocompletedelay 
ai autoindent ar autoread asd autoshelldir aw autowrite awa autowriteall bg 
background bs backspace bk backup bkc backupcopy bdir backupdir bex backupext 
bsk backupskip bdlay balloondelay beval ballooneval bevalterm balloonevalterm 
bexpr balloonexpr bo belloff bin binary bomb brk breakat bri breakindent briopt 
breakindentopt bsdir browsedir bh bufhidden bl buflisted bt buftype cmp casemap 
cdh cdhome cd cdpath cedit ccv charconvert chi chistory cin cindent cink 
cinkeys cino cinoptions cinsd cinscopedecls cinw cinwords cb clipboard cpm 
clipmethod ch cmdheight cwh cmdwinheight cc colorcolumn co columns com comments 
skipwhite nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained cms commentstring cp compatible cpt complete 
cfu completefunc cfc completefuzzycollect cia completeitemalign cot completeopt 
cpp completepopup csl completeslash cocu concealcursor cole conceallevel cf 
confirm ci copyindent cpo cpoptions cm cryptmethod cspc cscopepathcomp csprg 
cscopeprg csqf cscopequickfix csre cscoperelative cst cscopetag csto 
cscopetagorder csverb cscopeverbose crb cursorbind cuc cursorcolumn cul 
cursorline culopt cursorlineopt debug def define deco delcombine dict 
dictionary diff dia diffanchors dex diffexpr dip diffopt dg digraph dir 
directory dy display ead eadirection ed edcompatible emo emoji enc encoding eof 
endoffile eol endofline ea equalalways ep equalprg eb errorbells ef errorfile 
efm errorformat ek esckeys skipwhite nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained ei eventignore eiw eventignorewin et expandtab 
ex exrc fenc fileencoding fencs fileencodings ff fileformat ffs fileformats fic 
fileignorecase ft filetype fcs fillchars ffu findfunc fixeol fixendofline fcl 
foldclose fdc foldcolumn fen foldenable fde foldexpr fdi foldignore fdl 
foldlevel fdls foldlevelstart fmr foldmarker fdm foldmethod fml foldminlines 
fdn foldnestmax fdo foldopen fdt foldtext fex formatexpr flp formatlistpat fo 
formatoptions fp formatprg fs fsync gd gdefault gfm grepformat gp grepprg gcr 
guicursor gfn guifont gfs guifontset gfw guifontwide ghr guiheadroom gli 
guiligatures go guioptions guipty gtl guitablabel gtt guitabtooltip hf helpfile 
hh helpheight hlg helplang hid hidden hl highlight hi history hk hkmap hkp 
hkmapp skipwhite nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained hls hlsearch icon iconstring ic ignorecase 
imaf imactivatefunc imak imactivatekey imc imcmdline imd imdisable imi iminsert 
ims imsearch imsf imstatusfunc imst imstyle inc include inex includeexpr is 
incsearch inde indentexpr indk indentkeys inf infercase im insertmode ise 
isexpand isf isfname isi isident isk iskeyword isp isprint js joinspaces jop 
jumpoptions key kmp keymap km keymodel kpc keyprotocol kp keywordprg lmap 
langmap lm langmenu lnr langnoremap lrm langremap ls laststatus lz lazyredraw 
lhi lhistory lbr linebreak lines lsp linespace lisp lop lispoptions lw 
lispwords list lcs listchars lpl loadplugins luadll magic mef makeef menc 
makeencoding mp makeprg mps matchpairs mat matchtime mco maxcombine mfd 
maxfuncdepth mmd maxmapdepth skipwhite nextgroup=vimSetEqual,vimSetMod
+syn keyword vimOption contained mm maxmem mmp maxmempattern mmt maxmemtot msc 
maxsearchcount mis menuitems mopt messagesopt msm mkspellmem ml modeline mle 
modelineexpr mls modelines ma modifiable mod modified more mouse mousef 
mousefocus mh mousehide mousem mousemodel mousemev mousemoveevent mouses 
mouseshape mouset mousetime mzq mzquantum mzschemedll mzschemegcdll nf 
nrformats nu number nuw numberwidth ofu omnifunc odev opendevice opfunc 
operatorfunc pp packpath para paragraphs paste pt pastetoggle pex patchexpr pm 
patchmode pa path perldll pi preserveindent pvh previewheight pvp previewpopup 
pvw previewwindow pdev printdevice penc printencoding pexpr printexpr pfn 
printfont pheader printheader pmbcs printmbcharset pmbfn printmbfont popt 
printoptions prompt ph pumheight skipwhite nextgroup=vimSetEqual,vimSetMod
 syn keyword vimOption contained pmw pummaxwidth pw pumwidth pythondll 
pythonhome pythonthreedll pythonthreehome pyx pyxversion qftf quickfixtextfunc 
qe quoteescape ro readonly rdt redrawtime re regexpengine rnu relativenumber 
remap rop renderoptions report rs restorescreen ri revins rl rightleft rlc 
rightleftcmd rubydll ru ruler ruf rulerformat rtp runtimepath scr scroll scb 
scrollbind scf scrollfocus sj scrolljump so scrolloff sbo scrollopt sect 
sections secure sel selection slm selectmode ssop sessionoptions sh shell shcf 
shellcmdflag sp shellpipe shq shellquote srr shellredir ssl shellslash stmp 
shelltemp st shelltype sxe shellxescape sxq shellxquote sr shiftround sw 
shiftwidth shm shortmess sn shortname sbr showbreak sc showcmd sloc showcmdloc 
sft showfulltag skipwhite nextgroup=vimSetEqual,vimSetMod
 syn keyword vimOption contained sm showmatch smd showmode stal showtabline 
stpl showtabpanel ss sidescroll siso sidescrolloff scl signcolumn scs smartcase 
si smartindent sta smarttab sms smoothscroll sts softtabstop spell spc 
spellcapcheck spf spellfile spl spelllang spo spelloptions sps spellsuggest sb 
splitbelow spk splitkeep spr splitright sol startofline stl statusline su 
suffixes sua suffixesadd swf swapfile sws swapsync swb switchbuf smc synmaxcol 
syn syntax tcl tabclose tal tabline tpm tabpagemax tpl tabpanel tplo 
tabpanelopt ts tabstop tbs tagbsearch tc tagcase tfu tagfunc tl taglength tr 
tagrelative tag tags tgst tagstack tcldll term tbidi termbidi tenc termencoding 
tgc termguicolors twk termwinkey twsl termwinscroll tws termwinsize twt 
termwintype terse skipwhite nextgroup=vimSetEqual,vimSetMod
 syn keyword vimOption contained ta textauto tx textmode tw textwidth tsr 
thesaurus tsrfu thesaurusfunc top tildeop to timeout tm timeoutlen title 
titlelen titleold titlestring tb toolbar tbis toolbariconsize ttimeout ttm 
ttimeoutlen tbi ttybuiltin tf ttyfast ttym ttymouse tsl ttyscroll tty ttytype 
udir undodir udf undofile ul undolevels ur undoreload uc updatecount ut 
updatetime vsts varsofttabstop vts vartabstop vbs verbose vfile verbosefile 
vdir viewdir vop viewoptions vi viminfo vif viminfofile ve virtualedit vb 
visualbell warn wiv weirdinvert ww whichwrap wc wildchar wcm wildcharm wig 
wildignore wic wildignorecase wmnu wildmenu wim wildmode wop wildoptions wak 
winaltkeys wcr wincolor wi window wfb winfixbuf wfh winfixheight wfw 
winfixwidth wh winheight wmh winminheight skipwhite 
nextgroup=vimSetEqual,vimSetMod
@@ -102,15 +102,15 @@ syn match   vimOption contained   "t_k;"
 
 " vimOptions: These are the variable names {{{2
 " GEN_SYN_VIM: vimOption normal variable,           START_STR='syn keyword 
vimOptionVarName contained', END_STR=''
-syn keyword vimOptionVarName contained al aleph ari allowrevins ambw ambiwidth 
arab arabic arshape arabicshape acd autochdir ac autocomplete ai autoindent ar 
autoread asd autoshelldir aw autowrite awa autowriteall bg background bs 
backspace bk backup bkc backupcopy bdir backupdir bex backupext bsk backupskip 
bdlay balloondelay beval ballooneval bevalterm balloonevalterm bexpr 
balloonexpr bo belloff bin binary bomb brk breakat bri breakindent briopt 
breakindentopt bsdir browsedir bh bufhidden bl buflisted bt buftype cmp casemap 
cdh cdhome cd cdpath cedit ccv charconvert chi chistory cin cindent cink 
cinkeys cino cinoptions cinsd cinscopedecls cinw cinwords cb clipboard cpm 
clipmethod ch cmdheight cwh cmdwinheight cc colorcolumn co columns com comments 
cms commentstring
-syn keyword vimOptionVarName contained cp compatible cpt complete cfu 
completefunc cfc completefuzzycollect cia completeitemalign cot completeopt cpp 
completepopup csl completeslash cocu concealcursor cole conceallevel cf confirm 
ci copyindent cpo cpoptions cm cryptmethod cspc cscopepathcomp csprg cscopeprg 
csqf cscopequickfix csre cscoperelative cst cscopetag csto cscopetagorder 
csverb cscopeverbose crb cursorbind cuc cursorcolumn cul cursorline culopt 
cursorlineopt debug def define deco delcombine dict dictionary diff dia 
diffanchors dex diffexpr dip diffopt dg digraph dir directory dy display ead 
eadirection ed edcompatible emo emoji enc encoding eof endoffile eol endofline 
ea equalalways ep equalprg eb errorbells ef errorfile efm errorformat ek 
esckeys ei eventignore
-syn keyword vimOptionVarName contained eiw eventignorewin et expandtab ex exrc 
fenc fileencoding fencs fileencodings ff fileformat ffs fileformats fic 
fileignorecase ft filetype fcs fillchars ffu findfunc fixeol fixendofline fcl 
foldclose fdc foldcolumn fen foldenable fde foldexpr fdi foldignore fdl 
foldlevel fdls foldlevelstart fmr foldmarker fdm foldmethod fml foldminlines 
fdn foldnestmax fdo foldopen fdt foldtext fex formatexpr flp formatlistpat fo 
formatoptions fp formatprg fs fsync gd gdefault gfm grepformat gp grepprg gcr 
guicursor gfn guifont gfs guifontset gfw guifontwide ghr guiheadroom gli 
guiligatures go guioptions guipty gtl guitablabel gtt guitabtooltip hf helpfile 
hh helpheight hlg helplang hid hidden hl highlight hi history hk hkmap hkp 
hkmapp hls hlsearch
-syn keyword vimOptionVarName contained icon iconstring ic ignorecase imaf 
imactivatefunc imak imactivatekey imc imcmdline imd imdisable imi iminsert ims 
imsearch imsf imstatusfunc imst imstyle inc include inex includeexpr is 
incsearch inde indentexpr indk indentkeys inf infercase im insertmode ise 
isexpand isf isfname isi isident isk iskeyword isp isprint js joinspaces jop 
jumpoptions key kmp keymap km keymodel kpc keyprotocol kp keywordprg lmap 
langmap lm langmenu lnr langnoremap lrm langremap ls laststatus lz lazyredraw 
lhi lhistory lbr linebreak lines lsp linespace lisp lop lispoptions lw 
lispwords list lcs listchars lpl loadplugins luadll magic mef makeef menc 
makeencoding mp makeprg mps matchpairs mat matchtime mco maxcombine mfd 
maxfuncdepth mmd maxmapdepth
-syn keyword vimOptionVarName contained mm maxmem mmp maxmempattern mmt 
maxmemtot msc maxsearchcount mis menuitems mopt messagesopt msm mkspellmem ml 
modeline mle modelineexpr mls modelines ma modifiable mod modified more mouse 
mousef mousefocus mh mousehide mousem mousemodel mousemev mousemoveevent mouses 
mouseshape mouset mousetime mzq mzquantum mzschemedll mzschemegcdll nf 
nrformats nu number nuw numberwidth ofu omnifunc odev opendevice opfunc 
operatorfunc pp packpath para paragraphs paste pt pastetoggle pex patchexpr pm 
patchmode pa path perldll pi preserveindent pvh previewheight pvp previewpopup 
pvw previewwindow pdev printdevice penc printencoding pexpr printexpr pfn 
printfont pheader printheader pmbcs printmbcharset pmbfn printmbfont popt 
printoptions prompt
-syn keyword vimOptionVarName contained ph pumheight pmw pummaxwidth pw 
pumwidth pythondll pythonhome pythonthreedll pythonthreehome pyx pyxversion 
qftf quickfixtextfunc qe quoteescape ro readonly rdt redrawtime re regexpengine 
rnu relativenumber remap rop renderoptions report rs restorescreen ri revins rl 
rightleft rlc rightleftcmd rubydll ru ruler ruf rulerformat rtp runtimepath scr 
scroll scb scrollbind scf scrollfocus sj scrolljump so scrolloff sbo scrollopt 
sect sections secure sel selection slm selectmode ssop sessionoptions sh shell 
shcf shellcmdflag sp shellpipe shq shellquote srr shellredir ssl shellslash 
stmp shelltemp st shelltype sxe shellxescape sxq shellxquote sr shiftround sw 
shiftwidth shm shortmess sn shortname sbr showbreak sc showcmd sloc showcmdloc
-syn keyword vimOptionVarName contained sft showfulltag sm showmatch smd 
showmode stal showtabline stpl showtabpanel ss sidescroll siso sidescrolloff 
scl signcolumn scs smartcase si smartindent sta smarttab sms smoothscroll sts 
softtabstop spell spc spellcapcheck spf spellfile spl spelllang spo 
spelloptions sps spellsuggest sb splitbelow spk splitkeep spr splitright sol 
startofline stl statusline su suffixes sua suffixesadd swf swapfile sws 
swapsync swb switchbuf smc synmaxcol syn syntax tcl tabclose tal tabline tpm 
tabpagemax tpl tabpanel tplo tabpanelopt ts tabstop tbs tagbsearch tc tagcase 
tfu tagfunc tl taglength tr tagrelative tag tags tgst tagstack tcldll term 
tbidi termbidi tenc termencoding tgc termguicolors twk termwinkey twsl 
termwinscroll tws termwinsize
-syn keyword vimOptionVarName contained twt termwintype terse ta textauto tx 
textmode tw textwidth tsr thesaurus tsrfu thesaurusfunc top tildeop to timeout 
tm timeoutlen title titlelen titleold titlestring tb toolbar tbis 
toolbariconsize ttimeout ttm ttimeoutlen tbi ttybuiltin tf ttyfast ttym 
ttymouse tsl ttyscroll tty ttytype udir undodir udf undofile ul undolevels ur 
undoreload uc updatecount ut updatetime vsts varsofttabstop vts vartabstop vbs 
verbose vfile verbosefile vdir viewdir vop viewoptions vi viminfo vif 
viminfofile ve virtualedit vb visualbell warn wiv weirdinvert ww whichwrap wc 
wildchar wcm wildcharm wig wildignore wic wildignorecase wmnu wildmenu wim 
wildmode wop wildoptions wak winaltkeys wcr wincolor wi window wfb winfixbuf 
wfh winfixheight wfw winfixwidth
-syn keyword vimOptionVarName contained wh winheight wmh winminheight wmw 
winminwidth winptydll wiw winwidth wse wlseat wst wlsteal wtm wltimeoutlen wrap 
wm wrapmargin ws wrapscan write wa writeany wb writebackup wd writedelay 
xtermcodes
+syn keyword vimOptionVarName contained al aleph ari allowrevins ambw ambiwidth 
arab arabic arshape arabicshape acd autochdir ac autocomplete acl 
autocompletedelay ai autoindent ar autoread asd autoshelldir aw autowrite awa 
autowriteall bg background bs backspace bk backup bkc backupcopy bdir backupdir 
bex backupext bsk backupskip bdlay balloondelay beval ballooneval bevalterm 
balloonevalterm bexpr balloonexpr bo belloff bin binary bomb brk breakat bri 
breakindent briopt breakindentopt bsdir browsedir bh bufhidden bl buflisted bt 
buftype cmp casemap cdh cdhome cd cdpath cedit ccv charconvert chi chistory cin 
cindent cink cinkeys cino cinoptions cinsd cinscopedecls cinw cinwords cb 
clipboard cpm clipmethod ch cmdheight cwh cmdwinheight cc colorcolumn co columns
+syn keyword vimOptionVarName contained com comments cms commentstring cp 
compatible cpt complete cfu completefunc cfc completefuzzycollect cia 
completeitemalign cot completeopt cpp completepopup csl completeslash cocu 
concealcursor cole conceallevel cf confirm ci copyindent cpo cpoptions cm 
cryptmethod cspc cscopepathcomp csprg cscopeprg csqf cscopequickfix csre 
cscoperelative cst cscopetag csto cscopetagorder csverb cscopeverbose crb 
cursorbind cuc cursorcolumn cul cursorline culopt cursorlineopt debug def 
define deco delcombine dict dictionary diff dia diffanchors dex diffexpr dip 
diffopt dg digraph dir directory dy display ead eadirection ed edcompatible emo 
emoji enc encoding eof endoffile eol endofline ea equalalways ep equalprg eb 
errorbells ef errorfile
+syn keyword vimOptionVarName contained efm errorformat ek esckeys ei 
eventignore eiw eventignorewin et expandtab ex exrc fenc fileencoding fencs 
fileencodings ff fileformat ffs fileformats fic fileignorecase ft filetype fcs 
fillchars ffu findfunc fixeol fixendofline fcl foldclose fdc foldcolumn fen 
foldenable fde foldexpr fdi foldignore fdl foldlevel fdls foldlevelstart fmr 
foldmarker fdm foldmethod fml foldminlines fdn foldnestmax fdo foldopen fdt 
foldtext fex formatexpr flp formatlistpat fo formatoptions fp formatprg fs 
fsync gd gdefault gfm grepformat gp grepprg gcr guicursor gfn guifont gfs 
guifontset gfw guifontwide ghr guiheadroom gli guiligatures go guioptions 
guipty gtl guitablabel gtt guitabtooltip hf helpfile hh helpheight hlg helplang 
hid hidden hl highlight
+syn keyword vimOptionVarName contained hi history hk hkmap hkp hkmapp hls 
hlsearch icon iconstring ic ignorecase imaf imactivatefunc imak imactivatekey 
imc imcmdline imd imdisable imi iminsert ims imsearch imsf imstatusfunc imst 
imstyle inc include inex includeexpr is incsearch inde indentexpr indk 
indentkeys inf infercase im insertmode ise isexpand isf isfname isi isident isk 
iskeyword isp isprint js joinspaces jop jumpoptions key kmp keymap km keymodel 
kpc keyprotocol kp keywordprg lmap langmap lm langmenu lnr langnoremap lrm 
langremap ls laststatus lz lazyredraw lhi lhistory lbr linebreak lines lsp 
linespace lisp lop lispoptions lw lispwords list lcs listchars lpl loadplugins 
luadll magic mef makeef menc makeencoding mp makeprg mps matchpairs mat 
matchtime
+syn keyword vimOptionVarName contained mco maxcombine mfd maxfuncdepth mmd 
maxmapdepth mm maxmem mmp maxmempattern mmt maxmemtot msc maxsearchcount mis 
menuitems mopt messagesopt msm mkspellmem ml modeline mle modelineexpr mls 
modelines ma modifiable mod modified more mouse mousef mousefocus mh mousehide 
mousem mousemodel mousemev mousemoveevent mouses mouseshape mouset mousetime 
mzq mzquantum mzschemedll mzschemegcdll nf nrformats nu number nuw numberwidth 
ofu omnifunc odev opendevice opfunc operatorfunc pp packpath para paragraphs 
paste pt pastetoggle pex patchexpr pm patchmode pa path perldll pi 
preserveindent pvh previewheight pvp previewpopup pvw previewwindow pdev 
printdevice penc printencoding pexpr printexpr pfn printfont pheader 
printheader pmbcs printmbcharset
+syn keyword vimOptionVarName contained pmbfn printmbfont popt printoptions 
prompt ph pumheight pmw pummaxwidth pw pumwidth pythondll pythonhome 
pythonthreedll pythonthreehome pyx pyxversion qftf quickfixtextfunc qe 
quoteescape ro readonly rdt redrawtime re regexpengine rnu relativenumber remap 
rop renderoptions report rs restorescreen ri revins rl rightleft rlc 
rightleftcmd rubydll ru ruler ruf rulerformat rtp runtimepath scr scroll scb 
scrollbind scf scrollfocus sj scrolljump so scrolloff sbo scrollopt sect 
sections secure sel selection slm selectmode ssop sessionoptions sh shell shcf 
shellcmdflag sp shellpipe shq shellquote srr shellredir ssl shellslash stmp 
shelltemp st shelltype sxe shellxescape sxq shellxquote sr shiftround sw 
shiftwidth shm shortmess sn shortname
+syn keyword vimOptionVarName contained sbr showbreak sc showcmd sloc 
showcmdloc sft showfulltag sm showmatch smd showmode stal showtabline stpl 
showtabpanel ss sidescroll siso sidescrolloff scl signcolumn scs smartcase si 
smartindent sta smarttab sms smoothscroll sts softtabstop spell spc 
spellcapcheck spf spellfile spl spelllang spo spelloptions sps spellsuggest sb 
splitbelow spk splitkeep spr splitright sol startofline stl statusline su 
suffixes sua suffixesadd swf swapfile sws swapsync swb switchbuf smc synmaxcol 
syn syntax tcl tabclose tal tabline tpm tabpagemax tpl tabpanel tplo 
tabpanelopt ts tabstop tbs tagbsearch tc tagcase tfu tagfunc tl taglength tr 
tagrelative tag tags tgst tagstack tcldll term tbidi termbidi tenc termencoding 
tgc termguicolors twk termwinkey
+syn keyword vimOptionVarName contained twsl termwinscroll tws termwinsize twt 
termwintype terse ta textauto tx textmode tw textwidth tsr thesaurus tsrfu 
thesaurusfunc top tildeop to timeout tm timeoutlen title titlelen titleold 
titlestring tb toolbar tbis toolbariconsize ttimeout ttm ttimeoutlen tbi 
ttybuiltin tf ttyfast ttym ttymouse tsl ttyscroll tty ttytype udir undodir udf 
undofile ul undolevels ur undoreload uc updatecount ut updatetime vsts 
varsofttabstop vts vartabstop vbs verbose vfile verbosefile vdir viewdir vop 
viewoptions vi viminfo vif viminfofile ve virtualedit vb visualbell warn wiv 
weirdinvert ww whichwrap wc wildchar wcm wildcharm wig wildignore wic 
wildignorecase wmnu wildmenu wim wildmode wop wildoptions wak winaltkeys wcr 
wincolor wi window
+syn keyword vimOptionVarName contained wfb winfixbuf wfh winfixheight wfw 
winfixwidth wh winheight wmh winminheight wmw winminwidth winptydll wiw 
winwidth wse wlseat wst wlsteal wtm wltimeoutlen wrap wm wrapmargin ws wrapscan 
write wa writeany wb writebackup wd writedelay xtermcodes
 " GEN_SYN_VIM: vimOption term output code variable, START_STR='syn keyword 
vimOptionVarName contained', END_STR=''
 syn keyword vimOptionVarName contained t_AB t_AF t_AU t_AL t_al t_bc t_BE t_BD 
t_cd t_ce t_Ce t_CF t_cl t_cm t_Co t_CS t_Cs t_cs t_CV t_da t_db t_DL t_dl t_ds 
t_Ds t_EC t_EI t_fs t_fd t_fe t_GP t_IE t_IS t_ke t_ks t_le t_mb t_md t_me t_mr 
t_ms t_nd t_op t_RF t_RB t_RC t_RI t_Ri t_RK t_RS t_RT t_RV t_Sb t_SC t_se t_Sf 
t_SH t_SI t_Si t_so t_SR t_sr t_ST t_Te t_te t_TE t_ti t_TI t_Ts t_ts t_u7 t_ue 
t_us t_Us t_ut t_vb t_ve t_vi t_VS t_vs t_WP t_WS t_XM t_xn t_xs t_ZH t_ZR t_8f 
t_8b t_8u t_xo
 syn keyword vimOptionVarName contained t_F1 t_F2 t_F3 t_F4 t_F5 t_F6 t_F7 t_F8 
t_F9 t_k1 t_K1 t_k2 t_k3 t_K3 t_k4 t_K4 t_k5 t_K5 t_k6 t_K6 t_k7 t_K7 t_k8 t_K8 
t_k9 t_K9 t_KA t_kb t_kB t_KB t_KC t_kd t_kD t_KD t_KE t_KF t_KG t_kh t_KH t_kI 
t_KI t_KJ t_KK t_kl t_KL t_kN t_kP t_kr t_ku
diff --git a/src/insexpand.c b/src/insexpand.c
index 454466b30..b4364be63 100644
--- a/src/insexpand.c
+++ b/src/insexpand.c
@@ -2435,6 +2435,12 @@ ins_compl_new_leader(void)
     ins_compl_insert_bytes(compl_leader.string + get_compl_len(), -1);
     compl_used_match = FALSE;
 
+    if (p_acl > 0)
+    {
+       update_screen(UPD_VALID); // Show char (deletion) immediately
+       out_flush();
+    }
+
     if (compl_started)
     {
        ins_compl_set_original_text(compl_leader.string, compl_leader.length);
@@ -5428,7 +5434,7 @@ ins_compl_get_exp(pos_T *ini)
 {
     static ins_compl_next_state_T   st;
     static int                     st_cleared = FALSE;
-    int                i;
+    int                match_count;
     int                found_new_match;
     int                type = ctrl_x_mode;
     int                may_advance_cpt_idx = FALSE;
@@ -5579,10 +5585,10 @@ ins_compl_get_exp(pos_T *ini)
            && *st.e_cpt == NUL)                // Got to end of 'complete'
        found_new_match = FAIL;
 
-    i = -1;            // total of matches, unknown
+    match_count = -1;          // total of matches, unknown
     if (found_new_match == FAIL || (ctrl_x_mode_not_default()
                && !ctrl_x_mode_line_or_eval()))
-       i = ins_compl_make_cyclic();
+       match_count = ins_compl_make_cyclic();
 
     if (cfc_has_mode() && compl_get_longest && compl_num_bests > 0)
        fuzzy_longest_match();
@@ -5602,7 +5608,7 @@ ins_compl_get_exp(pos_T *ini)
     if (is_nearest_active())
        sort_compl_match_list(cp_compare_nearest);
 
-    return i;
+    return match_count;
 }
 
 /*
@@ -6130,7 +6136,7 @@ ins_compl_next(
 check_elapsed_time(void)
 {
 #ifdef ELAPSED_FUNC
-    if (cpt_sources_array == NULL)
+    if (cpt_sources_array == NULL || cpt_sources_index < 0)
        return;
 
     elapsed_T  *start_tv
@@ -7070,6 +7076,10 @@ ins_complete(int c, int enable_pum)
     int                save_w_wrow;
     int                save_w_leftcol;
     int                insert_match;
+    int                no_matches_found;
+#ifdef ELAPSED_FUNC
+    elapsed_T  compl_start_tv; // Timestamp when match collection starts
+#endif
 
     compl_direction = ins_compl_key2dir(c);
     insert_match = ins_compl_use_match(c);
@@ -7082,6 +7092,10 @@ ins_complete(int c, int enable_pum)
     else if (insert_match && stop_arrow() == FAIL)
        return FAIL;
 
+#ifdef ELAPSED_FUNC
+    if (compl_autocomplete && p_acl > 0)
+       ELAPSED_INIT(compl_start_tv);
+#endif
     compl_curr_win = curwin;
     compl_curr_buf = curwin->w_buffer;
     compl_shown_match = compl_curr_match;
@@ -7109,7 +7123,8 @@ ins_complete(int c, int enable_pum)
     }
 
     // we found no match if the list has only the "compl_orig_text"-entry
-    if (is_first_match(compl_first_match->cp_next))
+    no_matches_found = is_first_match(compl_first_match->cp_next);
+    if (no_matches_found)
     {
        // remove N_ADDS flag, so next ^X<> won't try to go to ADDING mode,
        // because we couldn't expand anything at first place, but if we used
@@ -7131,6 +7146,28 @@ ins_complete(int c, int enable_pum)
     if (!shortmess(SHM_COMPLETIONMENU) && !compl_autocomplete)
        ins_compl_show_statusmsg();
 
+    // Wait for the autocompletion delay to expire
+#ifdef ELAPSED_FUNC
+    if (compl_autocomplete && p_acl > 0 && !no_matches_found
+           && ELAPSED_FUNC(compl_start_tv) < p_acl)
+    {
+       cursor_on();
+       setcursor();
+       out_flush_cursor(FALSE, FALSE);
+       do
+       {
+           if (char_avail())
+           {
+               ins_compl_restart();
+               compl_interrupted = TRUE;
+               break;
+           }
+           else
+               ui_delay(2L, TRUE);
+       } while (ELAPSED_FUNC(compl_start_tv) < p_acl);
+    }
+#endif
+
     // Show the popup menu, unless we got interrupted.
     if (enable_pum && !compl_interrupted)
        show_pum(save_w_wrow, save_w_leftcol);
diff --git a/src/option.h b/src/option.h
index 52fcfefcf..b11245e44 100644
--- a/src/option.h
+++ b/src/option.h
@@ -524,6 +524,7 @@ EXTERN unsigned cia_flags;  // order flags of 
'completeitemalign'
 EXTERN char_u  *p_cot;         // 'completeopt'
 EXTERN unsigned        cot_flags;      // flags from 'completeopt'
 EXTERN int     p_ac;           // 'autocomplete'
+EXTERN long    p_acl;          // 'autocompletedelay'
 // Keep in sync with p_cot_values in optionstr.c
 #define COT_MENU       0x001
 #define COT_MENUONE    0x002
diff --git a/src/optiondefs.h b/src/optiondefs.h
index 632ccf25f..d716d8995 100644
--- a/src/optiondefs.h
+++ b/src/optiondefs.h
@@ -392,6 +392,9 @@ static struct vimoption options[] =
     {"autocomplete",  "ac", P_BOOL|P_VI_DEF,
                            (char_u *)&p_ac, PV_NONE, NULL,
                            NULL, {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
+    {"autocompletedelay", "acl", P_NUM|P_VI_DEF,
+                           (char_u *)&p_acl, PV_NONE, NULL, NULL,
+                           {(char_u *)0L, (char_u *)0L} SCTX_INIT},
 #endif
     {"autoindent",  "ai",   P_BOOL|P_VI_DEF,
                            (char_u *)&p_ai, PV_AI, NULL, NULL,
diff --git a/src/po/vim.pot b/src/po/vim.pot
index 43a8d64b2..b77bd8fc4 100644
--- a/src/po/vim.pot
+++ b/src/po/vim.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Vim
"
 "Report-Msgid-Bugs-To: vim-...@vim.org
"
-"POT-Creation-Date: 2025-08-07 16:17+0200
"
+"POT-Creation-Date: 2025-08-16 17:57+0200
"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>
"
 "Language-Team: LANGUAGE <l...@li.org>
"
@@ -9926,6 +9926,9 @@ msgstr ""
 msgid "automatic completion in insert mode"
 msgstr ""
 
+msgid "delay in msec before menu appears after typing"
+msgstr ""
+
 msgid "whether to use a popup menu for Insert mode completion"
 msgstr ""
 
diff --git a/src/testdir/dumps/Test_autocompletedelay_1.dump 
b/src/testdir/dumps/Test_autocompletedelay_1.dump
new file mode 100644
index 000000000..51128fc2f
--- /dev/null
+++ b/src/testdir/dumps/Test_autocompletedelay_1.dump
@@ -0,0 +1,10 @@
+|f+0&#ffffff0|o@1| @71
+|f|o@1|b|a|r| @68
+|f|o@1|b|a|r|b|a|z| @65
+|f> @73
+|f+0#0000001#ffd7ff255|o@1|b|a|r|b|a|z| @5| +0#4040ff13#ffffff0@59
+|f+0#0000001#ffd7ff255|o@1|b|a|r| @8| +0#4040ff13#ffffff0@59
+|f+0#0000001#ffd7ff255|o@1| @11| +0#4040ff13#ffffff0@59
+|~| @73
+|~| @73
+|-+2#0000000&@1| |I|N|S|E|R|T| |-@1| +0&&@44|4|,|1| @10|T|o|p| 
diff --git a/src/testdir/dumps/Test_autocompletedelay_2.dump 
b/src/testdir/dumps/Test_autocompletedelay_2.dump
new file mode 100644
index 000000000..65dc8f42e
--- /dev/null
+++ b/src/testdir/dumps/Test_autocompletedelay_2.dump
@@ -0,0 +1,10 @@
+|f+0&#ffffff0|o@1| @71
+|f|o@1|b|a|r| @68
+|f|o@1|b|a|r|b|a|z| @65
+|f> @73
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|-+2#0000000&@1| |I|N|S|E|R|T| |-@1| +0&&@44|4|,|1| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_autocompletedelay_3.dump 
b/src/testdir/dumps/Test_autocompletedelay_3.dump
new file mode 100644
index 000000000..d3ed65d90
--- /dev/null
+++ b/src/testdir/dumps/Test_autocompletedelay_3.dump
@@ -0,0 +1,10 @@
+|f+0&#ffffff0|o@1| @71
+|f|o@1|b|a|r| @68
+|f|o@1|b|a|r|b|a|z| @65
+|f|o> @72
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|-+2#0000000&@1| |I|N|S|E|R|T| |-@1| +0&&@44|4|,|1| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_autocompletedelay_4.dump 
b/src/testdir/dumps/Test_autocompletedelay_4.dump
new file mode 100644
index 000000000..53199f9d6
--- /dev/null
+++ b/src/testdir/dumps/Test_autocompletedelay_4.dump
@@ -0,0 +1,10 @@
+|f+0&#ffffff0|o@1| @71
+|f|o@1|b|a|r| @68
+|f|o@1|b|a|r|b|a|z| @65
+|f|o> @72
+|f+0#0000001#ffd7ff255|o@1|b|a|r|b|a|z| @5| +0#4040ff13#ffffff0@59
+|f+0#0000001#ffd7ff255|o@1|b|a|r| @8| +0#4040ff13#ffffff0@59
+|f+0#0000001#ffd7ff255|o@1| @11| +0#4040ff13#ffffff0@59
+|~| @73
+|~| @73
+|-+2#0000000&@1| |I|N|S|E|R|T| |-@1| +0&&@44|4|,|1| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_autocompletedelay_5.dump 
b/src/testdir/dumps/Test_autocompletedelay_5.dump
new file mode 100644
index 000000000..0dd4850d0
--- /dev/null
+++ b/src/testdir/dumps/Test_autocompletedelay_5.dump
@@ -0,0 +1,10 @@
+|f+0&#ffffff0|o@1| @71
+|f|o@1|b|a|r| @68
+|f|o@1|b|a|r|b|a|z| @65
+|f> @73
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|-+2#0000000&@1| |I|N|S|E|R|T| |-@1| +0&&@44|4|,|2| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_autocompletedelay_6.dump 
b/src/testdir/dumps/Test_autocompletedelay_6.dump
new file mode 100644
index 000000000..c792e09ea
--- /dev/null
+++ b/src/testdir/dumps/Test_autocompletedelay_6.dump
@@ -0,0 +1,10 @@
+|f+0&#ffffff0|o@1| @71
+|f|o@1|b|a|r| @68
+|f|o@1|b|a|r|b|a|z| @65
+|f> @73
+|f+0#0000001#ffd7ff255|o@1|b|a|r|b|a|z| @5| +0#4040ff13#ffffff0@59
+|f+0#0000001#ffd7ff255|o@1|b|a|r| @8| +0#4040ff13#ffffff0@59
+|f+0#0000001#ffd7ff255|o@1| @11| +0#4040ff13#ffffff0@59
+|~| @73
+|~| @73
+|-+2#0000000&@1| |I|N|S|E|R|T| |-@1| +0&&@44|4|,|2| @10|A|l@1| 
diff --git a/src/testdir/dumps/Test_autocompletedelay_7.dump 
b/src/testdir/dumps/Test_autocompletedelay_7.dump
new file mode 100644
index 000000000..954b785d8
--- /dev/null
+++ b/src/testdir/dumps/Test_autocompletedelay_7.dump
@@ -0,0 +1,10 @@
+|f+0&#ffffff0|o@1| @71
+|f|o@1|b|a|r| @68
+|f|o@1|b|a|r|b|a|z| @65
+|f>o@1| @71
+|f+0#0000001#e0e0e08|o@1| @11| +0#4040ff13#ffffff0@59
+|f+0#0000001#ffd7ff255|o@1|b|a|r| @8| +0#4040ff13#ffffff0@59
+|f+0#0000001#ffd7ff255|o@1|b|a|r|b|a|z| @5| +0#4040ff13#ffffff0@59
+|~| @73
+|~| @73
+|-+2#0000000&@1| |K|e|y|w|o|r|d| |c|o|m|p|l|e|t|i|o|n| |(|^|N|^|P|)| 
|m+0#00e0003&|a|t|c|h| |1| |o|f| |3| +0#0000000&@33
diff --git a/src/testdir/test_ins_complete.vim 
b/src/testdir/test_ins_complete.vim
index 9acee8fe3..f3ea3a29f 100644
--- a/src/testdir/test_ins_complete.vim
+++ b/src/testdir/test_ins_complete.vim
@@ -5460,4 +5460,38 @@ func Test_omni_start_invalid_col()
   set omnifunc& complete&
 endfunc
 
+func Test_autocompletedelay()
+  CheckScreendump
+
+  let lines =<< trim [SCRIPT]
+    call setline(1, ['foo', 'foobar', 'foobarbaz'])
+    set autocomplete
+  [SCRIPT]
+  call writefile(lines, 'XTest_autocomplete_delay', 'D')
+  let buf = RunVimInTerminal('-S XTest_autocomplete_delay', {'rows': 10})
+
+  call term_sendkeys(buf, "Gof")
+  call VerifyScreenDump(buf, 'Test_autocompletedelay_1', {})
+
+  call term_sendkeys(buf, "\<Esc>:set autocompletedelay=500\<CR>")
+  call term_sendkeys(buf, "Sf")
+  call VerifyScreenDump(buf, 'Test_autocompletedelay_2', {})
+  call term_sendkeys(buf, "o")
+  call VerifyScreenDump(buf, 'Test_autocompletedelay_3', {})
+  sleep 500m
+  call VerifyScreenDump(buf, 'Test_autocompletedelay_4', {})
+  call term_sendkeys(buf, "\<BS>")
+  call VerifyScreenDump(buf, 'Test_autocompletedelay_5', {})
+  sleep 500m
+  call VerifyScreenDump(buf, 'Test_autocompletedelay_6', {})
+
+  " During delay wait, user can open menu using CTRL_N completion
+  call term_sendkeys(buf, "\<Esc>:set completeopt=menuone,preinsert\<CR>")
+  call term_sendkeys(buf, "Sf\<C-N>")
+  call VerifyScreenDump(buf, 'Test_autocompletedelay_7', {})
+
+  call term_sendkeys(buf, "\<esc>")
+  call StopVimInTerminal(buf)
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab nofoldenable
diff --git a/src/version.c b/src/version.c
index 7e4682cc8..5488cf8a1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1638,
 /**/
     1637,
 /**/

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