":b {bufname}" tab-completion uses whole filepath

I use ':b' quite often.  And I use a substring of the bufname to jump to
that buffer.  Works quite well.

But a problem is that the substring I provide isn't only matched with
the buffer names but also the filenames.  See these examples:

    :ls
      1 #h   "example\predict.py"           line 25
      2  a   "deeplog\deeplog.py"           line 0
      4 %a   "example\train.py"             line 37
    :b deep<tab>

Then when I type ":b deep<tab>", the matches shown are:

    E:\projects\log-parsing\deeplog\example\predict.py
    deeplog\deeplog.py
    E:\projects\log-parsing\deeplog\example\train.py

We can see that vim is matching the filepaths instead of only the buffer
names.  Can I change this behavior?  Preferably with vimscripting, but
I'm willing to change source code too since I use this too often.

To be clear: I want only this match to be shown:

    deeplog\deeplog.py

Here's the version info:

    :ver
    VIM - Vi IMproved 9.1 (2024 Jan 02, compiled May 21 2024 02:04:14)
    MS-Windows 64-bit console version
    Included patches: 1-426
    Compiled by ACER@JUDAS
    Huge version without GUI.  Features included (+) or not (-):
    +acl                +ex_extra           +multi_lang         -tag_any_white
    +arabic             +extra_search       -mzscheme           -tcl
    +autocmd            -farsi              -netbeans_intg      +termguicolors
    +autochdir          +file_in_path       +num64              -terminal
    +autoservername     +find_in_path       +packages           -termresponse
    -balloon_eval       +float              +path_extra         +textobjects
    +balloon_eval_term  +folding            -perl               +textprop
    -browse             -footer             +persistent_undo    -tgetent
    ++builtin_terms     -gettext            +popupwin           +timers
    +byte_offset        -hangul_input       -postscript         +title
    +channel            +iconv/dyn          +printer            -toolbar
    +cindent            +insert_expand      +profile            +user_commands
    +clientserver       +ipv6               -python             +vartabs
    +clipboard          +job                -python3            +vertsplit
    +cmdline_compl      +jumplist           +quickfix           +vim9script
    +cmdline_hist       +keymap             +reltime            +viminfo
    +cmdline_info       +lambda             +rightleft          +virtualedit
    +comments           +langmap            -ruby               +visual
    +conceal            +libcall            +scrollbind         +visualextra
    +cryptv             +linebreak          +signs              +vreplace
    -cscope             +lispindent         +smartindent        +vtp
    +cursorbind         +listcmds           -sodium             +wildignore
    +cursorshape        +localmap           -sound              +wildmenu
    +dialog_con         -lua                +spell              +windows
    +diff               +menu               +startuptime        +writebackup
    +digraphs           +mksession          +statusline         -xattr
    -dnd                +modify_fname       -sun_workshop       -xfontset
    -ebcdic             +mouse              +syntax             -xim
    +emacs_tags         -mouseshape         +tag_binary         -xpm_w32
    +eval               +multi_byte_ime/dyn -tag_old_static     -xterm_save
       system vimrc file: "$VIM\vimrc"
         user vimrc file: "$HOME\_vimrc"
     2nd user vimrc file: "$HOME\vimfiles\vimrc"
     3rd user vimrc file: "$VIM\_vimrc"
          user exrc file: "$HOME\_exrc"
      2nd user exrc file: "$VIM\_exrc"
           defaults file: "$VIMRUNTIME\defaults.vim"
    Compilation: gcc -I. -Iproto -DWIN32 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DHAVE_PATHDEF -DFEAT_HUGE -DHAVE_STDINT_H -DFEAT_JOB_CHANNEL -DFEAT_IPV6 -DHAVE_INET_NTOP -DFEAT_MBYTE_IME -DDYNAMIC_IME -DDYNAMIC_ICONV -pipe -march=x86-64 -Wall -O3 -fomit-frame-pointer -freg-struct-return
    Linking: gcc -I. -Iproto -DWIN32 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DHAVE_PATHDEF -DFEAT_HUGE -DHAVE_STDINT_H -DFEAT_JOB_CHANNEL -DFEAT_IPV6 -DHAVE_INET_NTOP -DFEAT_MBYTE_IME -DDYNAMIC_IME -DDYNAMIC_ICONV -pipe -march=x86-64 -Wall -O3 -fomit-frame-pointer -freg-struct-return -s -municode -o vim.exe -lkernel32 -luser32 -lgdi32 -ladvapi32 -lcomdlg32 -lcomctl32 -lnetapi32 -lversion -lws2_32 -lole32 -luuid      

--
Enan

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