Fixes this bug:

    When 'bomb' is set or reset the file should be considered modified. (Tony
    Mechelynck)  Handle like 'endofline'.

A simple patch, which adds the local buffer variable 'b_start_bomb' and handles
'bomb' sets/resets in the same way as 'endofline' is handled.

Created by Martin Toft <mt@martintoft.dk> during Google Summer of Code 2007.


Index: src/buffer.c
===================================================================
RCS file: /cvsroot/vim/vim7/src/buffer.c,v
retrieving revision 1.73
diff -c -r1.73 buffer.c
*** src/buffer.c	19 Jun 2007 13:36:21 -0000	1.73
--- src/buffer.c	29 Jul 2007 18:31:49 -0000
***************
*** 502,507 ****
--- 502,508 ----
      buf->b_start_eol = TRUE;
  #ifdef FEAT_MBYTE
      buf->b_p_bomb = FALSE;
+     buf->b_start_bomb = FALSE;
  #endif
      buf->b_ml.ml_mfp = NULL;
      buf->b_ml.ml_flags = ML_EMPTY;		/* empty buffer */


Index: src/fileio.c
===================================================================
RCS file: /cvsroot/vim/vim7/src/fileio.c,v
retrieving revision 1.104
diff -c -r1.104 fileio.c
*** src/fileio.c	10 Jul 2007 15:10:29 -0000	1.104
--- src/fileio.c	29 Jul 2007 18:31:52 -0000
***************
*** 654,659 ****
--- 654,660 ----
  	curbuf->b_start_eol = TRUE;
  #ifdef FEAT_MBYTE
  	curbuf->b_p_bomb = FALSE;
+ 	curbuf->b_start_bomb = FALSE;
  #endif
      }
  
***************
*** 912,918 ****
--- 913,922 ----
  	file_rewind = FALSE;
  #ifdef FEAT_MBYTE
  	if (set_options)
+ 	{
  	    curbuf->b_p_bomb = FALSE;
+ 	    curbuf->b_start_bomb = FALSE;
+ 	}
  	conv_error = 0;
  #endif
      }
***************
*** 1361,1367 ****
--- 1365,1374 ----
  		    size -= blen;
  		    mch_memmove(ptr, ptr + blen, (size_t)size);
  		    if (set_options)
+ 		    {
  			curbuf->b_p_bomb = TRUE;
+ 			curbuf->b_start_bomb = TRUE;
+ 		    }
  		}
  
  		if (fio_flags == FIO_UCSBOM)


Index: src/option.c
===================================================================
RCS file: /cvsroot/vim/vim7/src/option.c,v
retrieving revision 1.125
diff -c -r1.125 option.c
*** src/option.c	24 Jul 2007 12:58:01 -0000	1.125
--- src/option.c	29 Jul 2007 18:31:55 -0000
***************
*** 7118,7123 ****
--- 7118,7128 ----
      /* when 'endofline' is changed, redraw the window title */
      else if ((int *)varp == &curbuf->b_p_eol)
  	need_maketitle = TRUE;
+ #ifdef FEAT_MBYTE
+     /* when 'bomb' is changed, redraw the window title */
+     else if ((int *)varp == &curbuf->b_p_bomb)
+ 	need_maketitle = TRUE;
+ #endif
  #endif
  
      /* when 'bin' is set also set some other options */
***************
*** 10604,10609 ****
--- 10609,10616 ----
      buf->b_start_ffc = *buf->b_p_ff;
      buf->b_start_eol = buf->b_p_eol;
  #ifdef FEAT_MBYTE
+     buf->b_start_bomb = buf->b_p_bomb;
+ 
      /* Only use free/alloc when necessary, they take time. */
      if (buf->b_start_fenc == NULL
  			     || STRCMP(buf->b_start_fenc, buf->b_p_fenc) != 0)
***************
*** 10617,10623 ****
  /*
   * Return TRUE if 'fileformat' and/or 'fileencoding' has a different value
   * from when editing started (save_file_ff() called).
!  * Also when 'endofline' was changed and 'binary' is set.
   * Don't consider a new, empty buffer to be changed.
   */
      int
--- 10624,10631 ----
  /*
   * Return TRUE if 'fileformat' and/or 'fileencoding' has a different value
   * from when editing started (save_file_ff() called).
!  * Also when 'endofline' was changed and 'binary' is set, or when 'bomb' was
!  * changed and 'binary' is not set.
   * Don't consider a new, empty buffer to be changed.
   */
      int
***************
*** 10636,10641 ****
--- 10644,10651 ----
      if (buf->b_p_bin && buf->b_start_eol != buf->b_p_eol)
  	return TRUE;
  #ifdef FEAT_MBYTE
+     if (!buf->b_p_bin && buf->b_start_bomb != buf->b_p_bomb)
+ 	return TRUE;
      if (buf->b_start_fenc == NULL)
  	return (*buf->b_p_fenc != NUL);
      return (STRCMP(buf->b_start_fenc, buf->b_p_fenc) != 0);


Index: src/structs.h
===================================================================
RCS file: /cvsroot/vim/vim7/src/structs.h,v
retrieving revision 1.75
diff -c -r1.75 structs.h
*** src/structs.h	26 Jul 2007 20:58:04 -0000	1.75
--- src/structs.h	29 Jul 2007 18:31:59 -0000
***************
*** 1453,1458 ****
--- 1453,1459 ----
  #ifdef FEAT_MBYTE
      char_u	*b_start_fenc;	/* 'fileencoding' when edit started or NULL */
      int		b_bad_char;	/* "++bad=" argument when edit started or 0 */
+     int		b_start_bomb;	/* 'bomb' when it was read */
  #endif
  
  #ifdef FEAT_EVAL