Add a few changes to moving between threads:

- It supports 'scrolloff' so that if you have this set it will move the
  buffer and cursor so the next/prev email starts at the top of the
  screen.
- It adds the ability to use shift-tab to go to the previous msg in
  the thread.

    Ian
---

Remove spurious vim_puts.

 vim/notmuch.vim | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/vim/notmuch.vim b/vim/notmuch.vim
index 331e930..bd007b1 100644
--- a/vim/notmuch.vim
+++ b/vim/notmuch.vim
@@ -39,6 +39,7 @@ let g:notmuch_show_maps = {
        \ 'p':          'show_save_patches()',
        \ 'r':          'show_reply()',
        \ '?':          'show_info()',
+       \ '<S-Tab>':    'show_prev_msg()',
        \ '<Tab>':      'show_next_msg()',
        \ 'c':          'compose()',
        \ }
@@ -113,6 +114,21 @@ EOF
        call s:kill_this_buffer()
 endfunction
 
+function! s:show_prev_msg()
+ruby << EOF
+       r, c = $curwin.cursor
+       n = $curbuf.line_number
+       i = $messages.index { |m| n >= m.start && n <= m.end }
+       m = $messages[i - 1] if i > 0
+       if m
+               r = m.body_start + 1
+               scrolloff = VIM::evaluate("&scrolloff")
+               VIM::command("normal #{m.start + scrolloff}zt")
+               $curwin.cursor = r + scrolloff, c
+       end
+EOF
+endfunction
+
 function! s:show_next_msg()
 ruby << EOF
        r, c = $curwin.cursor
@@ -121,8 +137,9 @@ ruby << EOF
        m = $messages[i + 1]
        if m
                r = m.body_start + 1
-               VIM::command("normal #{m.start}zt")
-               $curwin.cursor = r, c
+               scrolloff = VIM::evaluate("&scrolloff")
+               VIM::command("normal #{m.start + scrolloff}zt")
+               $curwin.cursor = r + scrolloff, c
        end
 EOF
 endfunction
-- 
1.9.3

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