Re: Omnicomplete shows strange behavior when preview window is enabled

On Thursday, February 7, 2013 10:23:47 AM UTC-6, Benjamin Isbarn wrote:
> It might be an issue with Konsole. I use Konsole on all my machines. I
>
> downloaded xterm and tried it and it worked, but when i resized the window
>
> (the xterm window) i had the same issue.
>

It is not a terminal issue, I see it on Windows gvim. I see the issue with
syntax folding enabled and closed folds in the window; I do not use
cursorcolumn except for a quick mapping to toggle it on when I want to quickly
find the cursor, then I toggle it back off.

Today I finally had a reproducible situation where I see the issue, so I dug
through my .vimrc to find the lines causing the problem.

Here are the lines:

" get rid of scrolloff option for certain buffers like the quickfix and
" preview windows
autocmd BufEnter *
\ if (&ft=='qf' || &previewwindow || (bufname('%') ==# "__Tag_List__" || bufname("%")==?'__Tagbar__')) && !exists('s:scrolloff_sav') |
\ let s:scrolloff_sav=&scrolloff |
\ set scrolloff=0 |
\ endif
" File type will not be set on the first BufEnter
autocmd Filetype qf
\ if !exists('s:scrolloff_sav') |
\ let s:scrolloff_sav=&scrolloff |
\ set scrolloff=0 |
\ endif
autocmd BufLeave *
\ if (&ft=='qf' || &previewwindow || (bufname('%') ==# "__Tag_List__" || bufname("%")==?'__Tagbar__')) && exists('s:scrolloff_sav') |
\ let &scrolloff=s:scrolloff_sav |
\ unlet s:scrolloff_sav |
\ endif

A few relevant settings:

completeopt=menuone,preview
omnifunc=ccomplete#Complete
foldmethod=syntax
scrolloff=5

If I use the following procedure with the above autocmds in my .vimrc, I see the
popup menu flash briefly and go invisible. The preview window gets updated
properly as I press the <Up> and <Down> buttons as if the menu was visible.
<C-N> and <C-P> work as they are supposed to. But the popup menu stays
inivisible.

1. Edit a C file (the one I used was a proprietary code file for my employer, I
can't share it, sorry).
2. Go to a place in the C file in a nested fold (in my code, it is 5 levels
deep).
3. Close all folds with zM
4. Show the cursor line with zv
5. Type a partial match and press <C-X><C-O> to start omnicompletion (which
includes tags, I believe).

Now I see the issue or not, depending on my autocmds above.

I think what may be happening is that my autocmds are adjusting scrolloff on
BufEnter/BufLeave, which triggers because the preview window is most likely
entered to update it to show the completion menu info. When scrolloff is
updated, the window positions may change. Perhaps changing window scroll
position via autocmd while the completion menu is up causes problems.

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