Comment 6 for bug 175347

It looks like the bug fixed in this patch of Vim:

Patch 7.3.536
Problem: When spell checking the German sharp s is not seen as a word
            character. (Aexl Bender)
Solution: In utf_islower() return true for the sharp s. Note: also need
            updated spell file for this to take effect.
Files: src/mbyte.c

*** ../vim-7.3.535/src/mbyte.c 2012-06-01 15:20:49.000000000 +0200
--- src/mbyte.c 2012-06-01 16:50:41.000000000 +0200
***************
*** 2949,2955 ****
  {
        {0x61,0x7a,1,-32},
        {0xb5,0xb5,-1,743},
! {0xe0,0xf6,1,-32},
        {0xf8,0xfe,1,-32},
        {0xff,0xff,-1,121},
        {0x101,0x12f,2,-1},
--- 2949,2955 ----
  {
        {0x61,0x7a,1,-32},
        {0xb5,0xb5,-1,743},
! {0xe0,0xf6,1,-32}, /* 0xdf (German sharp s) is not upper-cased */
        {0xf8,0xfe,1,-32},
        {0xff,0xff,-1,121},
        {0x101,0x12f,2,-1},
***************
*** 3129,3135 ****
  utf_islower(a)
      int a;
  {
! return (utf_toupper(a) != a);
  }

  /*
--- 3129,3136 ----
  utf_islower(a)
      int a;
  {
! /* German sharp s is lower case but has no upper case equivalent. */
! return (utf_toupper(a) != a) || a == 0xdf;
  }

  /*
*** ../vim-7.3.535/src/version.c 2012-06-01 15:20:49.000000000 +0200
--- src/version.c 2012-06-01 17:45:17.000000000 +0200
***************
*** 716,717 ****
--- 716,719 ----
  { /* Add new patch number below this line */
+ /**/
+ 536,
  /**/