Single digit "3" on its own blocks/breaks formatting

[mlawren]

Starting with this text for example:

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

If I add text in the middle of the paragraph then it fails to wrap properly at the occurance of the "3":

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
A B C D E F G H I J K L M N O P Q R S T Free Software Foundation;
either version
3 of the License, or (at your option) any later version.

[reedes]

I suspect this has to do with the setl formatoptions+=1 setting, where it's not behaving as expected.

I'll try to reproduce the problem. BTW, what version of Vim are you using?

[mlawren]

I'll try to reproduce the problem. BTW, what version of Vim are you
using?

I'm on a Debian testing box with vim 7.4:

    VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Mar  3 2016 10:24:12)
    Included patches: 1-963
    Modified by pkg-vim-maintainers@lists.alioth.debian.org
    Compiled by pkg-vim-maintainers@lists.alioth.debian.org
    Huge version with GTK2 GUI.  Features included (+) or not (-):
    +acl             +farsi           +mouse_netterm   +syntax
    +arabic          +file_in_path    +mouse_sgr       +tag_binary
    +autocmd         +find_in_path    -mouse_sysmouse  +tag_old_static
    +balloon_eval    +float           +mouse_urxvt     -tag_any_white
    +browse          +folding         +mouse_xterm     +tcl
    ++builtin_terms  -footer          +multi_byte      +terminfo
    +byte_offset     +fork()          +multi_lang      +termresponse
    +cindent         +gettext         -mzscheme        +textobjects
    +clientserver    -hangul_input    +netbeans_intg   +title
    +clipboard       +iconv           +path_extra      +toolbar
    +cmdline_compl   +insert_expand   +perl            +user_commands
    +cmdline_hist    +jumplist        +persistent_undo +vertsplit
    +cmdline_info    +keymap          +postscript      +virtualedit
    +comments        +langmap         +printer         +visual
    +conceal         +libcall         +profile         +visualextra
    +cryptv          +linebreak       +python          +viminfo
    +cscope          +lispindent      -python3         +vreplace
    +cursorbind      +listcmds        +quickfix        +wildignore
    +cursorshape     +localmap        +reltime         +wildmenu
    +dialog_con_gui  +lua             +rightleft       +windows
    +diff            +menu            +ruby            +writebackup
    +digraphs        +mksession       +scrollbind      +X11
    +dnd             +modify_fname    +signs           -xfontset
    -ebcdic          +mouse           +smartindent     +xim
    +emacs_tags      +mouseshape      -sniff           +xsmp_interact
    +eval            +mouse_dec       +startuptime     +xterm_clipboard
    +ex_extra        +mouse_gpm       +statusline      -xterm_save
    +extra_search    -mouse_jsbterm   -sun_workshop    +xpm
       system vimrc file: "$VIM/vimrc"
         user vimrc file: "$HOME/.vimrc"
     2nd user vimrc file: "~/.vim/vimrc"
          user exrc file: "$HOME/.exrc"
      system gvimrc file: "$VIM/gvimrc"
        user gvimrc file: "$HOME/.gvimrc"
    2nd user gvimrc file: "~/.vim/gvimrc"
        system menu file: "$VIMRUNTIME/menu.vim"
      fall-back for $VIM: "/usr/share/vim"
    Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK  -pthread -I/usr/include/gtk-2.0 -I/usr/lib/i386-linux-gnu/gtk-2.0/include -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/libpng12 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng12 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/freetype2 -Wdate-time  -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1      -I/usr/include/tcl8.6  -D_REENTRANT=1  -D_THREAD_SAFE=1  -D_LARGEFILE64_SOURCE=1  
    Linking: gcc   -L. -Wl,-z,relro -L/build/ruby2.3-usp2cW/ruby2.3-2.3.0/debian/lib -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,-E  -fPIE -pie -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim   -lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lfontconfig -lfreetype -lSM -lICE -lXpm -lXt -lX11 -lXdmcp -lSM -lICE  -lm -ltinfo -lnsl  -lselinux  -lacl -lattr -lgpm -ldl  -L/usr/lib -llua5.2 -Wl,-E  -fstack-protector-strong -L/usr/local/lib  -L/usr/lib/i386-linux-gnu/perl/5.22/CORE -lperl -ldl -lm -lpthread -lcrypt -L/usr/lib/python2.7/config-i386-linux-gnu -lpython2.7 -lpthread -ldl -lutil -lm -Xlinker -export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions  -L/usr/lib/i386-linux-gnu -ltcl8.6 -ldl -lz -lpthread -lieee -lm -lruby-2.3 -lpthread -lgmp -ldl -lcrypt -lm     

Mark Lawrence