ycm and autoindent: whitespace sometimes not removed

[mklinik]

Vim with autoindent on adds whitespace when starting a new line. When pressing <esc> without typing anything, the whitespace is removed again. When ycm is activated, sometimes this whitespace is not removed. Sometimes it is.

How to reproduce:

1. Edit some file, e.g. vim foo.hs
2. Have autoindent on, smartindent and cindent off. I'm not sure if other settings are relevant, the output of :set is added below.
3. Type the following: i<space>``<space>hello<esc>o<esc>

Result: The first line consists of two spaces, followed by the word "hello". The second line consists of two spaces.
Expected: The second line is empty.

ycm version b7eded1

:version                                                                                                                              
VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Feb  5 2013 08:59:41)
Included patches: 1-798

:set
--- Options ---
  autoindent          cscopeverbose       incsearch           shiftwidth=2        tabstop=2           ttyfast
  backspace=2         filetype=haskell    laststatus=2        showcmd             tags=tags           ttymouse=xterm2
  colorcolumn=+1      helplang=en         ruler               showmatch         notimeout             updatetime=2000
  cscopetag           hidden              scroll=15           spelllang=de        title               t_Co=255
  cscopetagorder=1    hlsearch            scrolloff=10        syntax=haskell      ttimeout
  comments=s1fl:{-,mb:-,ex:-},:--
  commentstring=-- %s
  completefunc=youcompleteme#Complete
  completeopt=menuone
  fileencoding=utf-8
  fileencodings=ucs-bom,utf-8,default,latin1
  formatoptions=croql
  include=^import\s*\(qualified\)\?\s*
  includeexpr=substitute(v:fname,'\.','/','g').'.'
  printoptions=paper:letter
  runtimepath=~/.vim,~/.vim/bundle/YouCompleteMe,~/.vim/bundle/notmuch,~/.vim/bundle/potwiki,~/.vim/bundle/vim-fugitive,/var/lib/vim/addons,/usr/
share/vim/vimfiles,/usr/share/vim/vim73,/usr/share/vim/vimfiles/after,/var/lib/vim/addons/after,~/.vim/after
  statusline=%t:%l,%v %L%m
  suffixes=.bak,~,.swp,.o,.info,.aux,.log,.dvi,.bbl,.blg,.brf,.cb,.ind,.idx,.ilg,.inx,.out,.toc
  suffixesadd=hs,lhs,hsc
  wildmode=longest,list

[Valloric]

Duplicate of #15