[Bug 1900670] [NEW] vimdiff confuses lines

[Rostislav]

Public bug reported:

I try to see diff of two files in my Ubuntu 20.04.

$ vimdiff outlog_20201020082321-head.log outlog_20201020084056-head.log

The diff matches wrong lines and highlights them strangely..
Reproducible with removed ~/.vimrc and ~/.vim.

$ vim --version
VIM - Vi IMproved 8.1 (2018 May 18, compiled Apr 15 2020 06:40:31)
Included patches: 1-2269
Modified by team+vim at tracker.debian.org
Compiled by team+vim at tracker.debian.org
Huge version without GUI.  Features included (+) or not (-):
+acl               -farsi             -mouse_sysmouse    -tag_any_white
+arabic            +file_in_path      +mouse_urxvt       -tcl
+autocmd           +find_in_path      +mouse_xterm       +termguicolors
+autochdir         +float             +multi_byte        +terminal
-autoservername    +folding           +multi_lang        +terminfo
-balloon_eval      -footer            -mzscheme          +termresponse
+balloon_eval_term +fork()            +netbeans_intg     +textobjects
-browse            +gettext           +num64             +textprop
++builtin_terms    -hangul_input      +packages          +timers
+byte_offset       +iconv             +path_extra        +title
+channel           +insert_expand     -perl              -toolbar
+cindent           +job               +persistent_undo   +user_commands
-clientserver      +jumplist          +postscript        +vartabs
-clipboard         +keymap            +printer           +vertsplit
+cmdline_compl     +lambda            +profile           +virtualedit
+cmdline_hist      +langmap           -python            +visual
+cmdline_info      +libcall           +python3           +visualextra
+comments          +linebreak         +quickfix          +viminfo
+conceal           +lispindent        +reltime           +vreplace
+cryptv            +listcmds          +rightleft         +wildignore
+cscope            +localmap          -ruby              +wildmenu
+cursorbind        -lua               +scrollbind        +windows
+cursorshape       +menu              +signs             +writebackup
+dialog_con        +mksession         +smartindent       -X11
+diff              +modify_fname      +sound             -xfontset
+digraphs          +mouse             +spell             -xim
-dnd               -mouseshape        +startuptime       -xpm
-ebcdic            +mouse_dec         +statusline        -xsmp
+emacs_tags        +mouse_gpm         -sun_workshop      -xterm_clipboard
+eval              -mouse_jsbterm     +syntax            -xterm_save
+ex_extra          +mouse_netterm     +tag_binary        
+extra_search      +mouse_sgr         -tag_old_static    
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H   -Wdate-time  -g -O2 -fdebug-prefix-map=/build/vim-iU6mZD/vim-8.1.2269=. -fstack-protector-strong -Wformat -Werror=format-security -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1       
Linking: gcc   -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim        -lm -ltinfo -lnsl  -lselinux  -lcanberra -lacl -lattr -lgpm -ldl     -L/usr/lib/python3.8/config-3.8-x86_64-linux-gnu -lpython3.8 -lcrypt -lpthread -ldl -lutil -lm -lm      

Any clue?  Thank you!

** Affects: vim (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "screenshot"
   https://bugs.launchpad.net/bugs/1900670/+attachment/5424567/+files/vimbug.png

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https://bugs.launchpad.net/bugs/1900670

Title:
  vimdiff confuses lines

Status in vim package in Ubuntu:
  New

Bug description:
  I try to see diff of two files in my Ubuntu 20.04.

  $ vimdiff outlog_20201020082321-head.log
  outlog_20201020084056-head.log

  The diff matches wrong lines and highlights them strangely..
  Reproducible with removed ~/.vimrc and ~/.vim.

  $ vim --version
  VIM - Vi IMproved 8.1 (2018 May 18, compiled Apr 15 2020 06:40:31)
  Included patches: 1-2269
  Modified by team+vim at tracker.debian.org
  Compiled by team+vim at tracker.debian.org
  Huge version without GUI.  Features included (+) or not (-):
  +acl               -farsi             -mouse_sysmouse    -tag_any_white
  +arabic            +file_in_path      +mouse_urxvt       -tcl
  +autocmd           +find_in_path      +mouse_xterm       +termguicolors
  +autochdir         +float             +multi_byte        +terminal
  -autoservername    +folding           +multi_lang        +terminfo
  -balloon_eval      -footer            -mzscheme          +termresponse
  +balloon_eval_term +fork()            +netbeans_intg     +textobjects
  -browse            +gettext           +num64             +textprop
  ++builtin_terms    -hangul_input      +packages          +timers
  +byte_offset       +iconv             +path_extra        +title
  +channel           +insert_expand     -perl              -toolbar
  +cindent           +job               +persistent_undo   +user_commands
  -clientserver      +jumplist          +postscript        +vartabs
  -clipboard         +keymap            +printer           +vertsplit
  +cmdline_compl     +lambda            +profile           +virtualedit
  +cmdline_hist      +langmap           -python            +visual
  +cmdline_info      +libcall           +python3           +visualextra
  +comments          +linebreak         +quickfix          +viminfo
  +conceal           +lispindent        +reltime           +vreplace
  +cryptv            +listcmds          +rightleft         +wildignore
  +cscope            +localmap          -ruby              +wildmenu
  +cursorbind        -lua               +scrollbind        +windows
  +cursorshape       +menu              +signs             +writebackup
  +dialog_con        +mksession         +smartindent       -X11
  +diff              +modify_fname      +sound             -xfontset
  +digraphs          +mouse             +spell             -xim
  -dnd               -mouseshape        +startuptime       -xpm
  -ebcdic            +mouse_dec         +statusline        -xsmp
  +emacs_tags        +mouse_gpm         -sun_workshop      -xterm_clipboard
  +eval              -mouse_jsbterm     +syntax            -xterm_save
  +ex_extra          +mouse_netterm     +tag_binary        
  +extra_search      +mouse_sgr         -tag_old_static    
     system vimrc file: "$VIM/vimrc"
       user vimrc file: "$HOME/.vimrc"
   2nd user vimrc file: "~/.vim/vimrc"
        user exrc file: "$HOME/.exrc"
         defaults file: "$VIMRUNTIME/defaults.vim"
    fall-back for $VIM: "/usr/share/vim"
  Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H   -Wdate-time  -g -O2 -fdebug-prefix-map=/build/vim-iU6mZD/vim-8.1.2269=. -fstack-protector-strong -Wformat -Werror=format-security -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1       
  Linking: gcc   -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim        -lm -ltinfo -lnsl  -lselinux  -lcanberra -lacl -lattr -lgpm -ldl     -L/usr/lib/python3.8/config-3.8-x86_64-linux-gnu -lpython3.8 -lcrypt -lpthread -ldl -lutil -lm -lm      

  Any clue?  Thank you!

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