":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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