[vim/vim] complete() with one item and completeopt=fuzzy,longest sometimes doesn't work? (Issue #19008)

[D. Ben Knoble]

benknoble created an issue (vim/vim#19008)

I've narrowed it down as much as I can for the moment, but I'm not yet sure there's a bug. It goes like this:

• Put the following text in clean.vim:

  " load with vim --clean -u <this-file>
  if &compatible
    set nocompatible
  endif
  
  set completeopt+=fuzzy,longest
  
  inoremap <C-a> <C-r>=complete(col('.') - getline('.')->matchstr('\<\f\+\%'.col('.').'c')->strlen(), ['item'])<enter>
  

• Run vim --clean -u clean.vim, then i<C-a>. With this reproduction, I get a "0" inserted in the buffer and no completion.

In my actual use case (see also mapping), I just get nothing inserted and no completion.

My current version is below

VIM - Vi IMproved 9.1 (2024 Jan 02, compilé Dec 20 2025 21:43:43)
Rustines incluses : 1-2001
Modifié par Gentoo-9999 (RIP Bram)
Compilé par benknoble@localhost
Énorme version sans interface graphique.  Fonctionnalités incluses (+) ou non (-) :
+acl
+arabic
+autocmd
+autochdir
-autoservername
-balloon_eval
+balloon_eval_term
-browse
++builtin_terms
+byte_offset
+channel
+cindent
+clientserver
+clipboard
+clipboard_provider
+cmdline_compl
+cmdline_hist
+cmdline_info
+comments
+conceal
+cryptv
-cscope
+cursorbind
+cursorshape
+dialog_con
+diff
+digraphs
-dnd
-ebcdic
+emacs_tags
+eval
+ex_extra
+extra_search
-farsi
+file_in_path
+find_in_path
+float
+folding
-footer
+fork()
+gettext
-hangul_input
+iconv
+insert_expand
+ipv6
+job
+jumplist
+keymap
+lambda
+langmap
+libcall
+linebreak
+lispindent
+listcmds
+localmap
-lua
+menu
+mksession
+modify_fname
+mouse
-mouseshape
+mouse_dec
+mouse_gpm
-mouse_jsbterm
+mouse_netterm
+mouse_sgr
-mouse_sysmouse
+mouse_urxvt
+mouse_xterm
+multi_byte
+multi_lang
-mzscheme
+netbeans_intg
+num64
+packages
+path_extra
-perl
+persistent_undo
+popupwin
+postscript
+printer
+profile
-python
-python3
+quickfix
+reltime
+rightleft
-ruby
+scrollbind
+signs
+smartindent
-socketserver
+sodium
+sound
+spell
+startuptime
+statusline
-sun_workshop
+syntax
+tabpanel
+tag_binary
-tag_old_static
-tag_any_white
-tcl
+termguicolors
+terminal
+terminfo
+termresponse
+textobjects
+textprop
+timers
+title
-toolbar
+user_commands
+vartabs
+vertsplit
+vim9script
+viminfo
+virtualedit
+visual
+visualextra
+vreplace
-wayland
-wayland_clipboard
-wayland_focus_steal
+wildignore
+wildmenu
+windows
+writebackup
+X11
+xattr
+xfontset
-xim
-xpm
+xsmp_interact
+xterm_clipboard
-xterm_save
         fichier vimrc système : "/etc/vim/vimrc"
     fichier vimrc utilisateur : "$HOME/.vimrc"
  2e fichier vimrc utilisateur : "~/.vim/vimrc"
  3e fichier vimrc utilisateur : "~/.config/vim/vimrc"
      fichier exrc utilisateur : "$HOME/.exrc"
 fichier de valeurs par défaut : "$VIMRUNTIME/defaults.vim"
               $VIM par défaut : "/usr/share/vim"
Compilation : x86_64-pc-linux-gnu-gcc -c -I. -Iproto -DHAVE_CONFIG_H -march=native -O2 -pipe -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 
Édition de liens : x86_64-pc-linux-gnu-gcc -Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs -L/usr/local/lib -o vim -lSM -lICE -lXpm -lXt -lX11 -lXdmcp -lSM -lICE -lm -ltinfo -lcanberra -lsodium -lacl -lattr -lgpm 

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