Bug#868252: vim-nox: pressing <CR> on last line of a foldmethod=manual behaves differently at end of file

[Daniel Shahaf]

Package: vim-nox
Version: 2:8.0.0197-5
Severity: normal

Dear Maintainer,

I use foldmethod=manual.  When I want to add a line following the last
line of a fold, I use «A<CR>» if I want the line new to be included in
the fold, and «o» if I want the new line not to be included in the fold.

However, I find that «A<CR>» behaves differently in the following two
cases:

1. The current line is the last line of a fold and of the file

2. The current line is the last line of a fold but not the last line of the file

In case #2, «A<CR>» and «o» behave as I described above.

In case #1, «A<CR>» adds a new line to the file but doesn't make it part
of the fold, i.e., it behaves as «o» does.

I expected «A<CR>» in case #1 to add a new line to the file *and to make
it part of the fold*, as it does in case #2.

Case #1 (the problem case) is:

    % vim.nox -Nu NONE -c 'set fdc=2' -c 'normal! zf0' -c 'execute "normal! A\<CR>"'

Case #2 (the role model / reference case) is:

    % vim.nox  -Nu NONE -c 'set fdc=2' -c 'normal! 2o' -c 'normal! ggzfjzRggj' -c 'execute "normal! A\<CR>"'

To be clear, the incumbent behaviour — adding a line to the file but not
to the fold — should continue to be available under the «o» normal mode
command, for the same reason: consistency with the not-end-of-file case.

I reproduced this in an uptodate sid chroot.

Cheers,

Daniel


-- Package-specific info:

--- real paths of main Vim binaries ---
/usr/bin/vi is /usr/bin/vim.nox
/usr/bin/vim is /usr/bin/vim.nox

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968), LANGUAGE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash
Init: unable to detect

Versions of packages vim-nox depends on:
ii  libacl1       2.2.52-3+b1
ii  libc6         2.24-12
ii  libgpm2       1.20.4-6.2+b1
ii  liblua5.2-0   5.2.4-1.1+b2
ii  libperl5.24   5.24.1-7
ii  libpython3.5  3.5.3-3
ii  libruby2.3    2.3.3-1
ii  libselinux1   2.6-3+b2
ii  libtcl8.6     8.6.6+dfsg-1+b1
ii  libtinfo5     6.0+20170708-1
ii  vim-common    2:8.0.0197-5
ii  vim-runtime   2:8.0.0197-5

vim-nox recommends no packages.

Versions of packages vim-nox suggests:
pn  cscope   <none>
pn  vim-doc  <none>

-- no debconf information