To: vim-dev@vim.org
Subject: Patch 7.1.234
Fcc: outbox
From: Bram Moolenaar <Bram@moolenaar.net>
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------------
 
Patch 7.1.234
Problem:    When diff'ing three files the third one isn't displayed correctly.
	    (Gary Johnson)
Solution:   Compute the size of diff blocks correctly when merging blocks.
	    Compute filler lines correctly when scrolling.
Files:	    src/diff.c
 
 
*** ../vim-7.1.233/src/diff.c	Fri Oct 19 18:57:33 2007
--- src/diff.c	Fri Jan 18 17:32:31 2008
***************
*** 1299,1305 ****
  	    }
  	    else
  		/* second overlap of new block with existing block */
! 		dp->df_count[idx_new] += count_new - count_orig;
  
  	    /* Adjust the size of the block to include all the lines to the
  	     * end of the existing block or the new diff, whatever ends last. */
--- 1299,1307 ----
  	    }
  	    else
  		/* second overlap of new block with existing block */
! 		dp->df_count[idx_new] += count_new - count_orig
! 		    + dpl->df_lnum[idx_orig] + dpl->df_count[idx_orig]
! 		    - (dp->df_lnum[idx_orig] + dp->df_count[idx_orig]);
  
  	    /* Adjust the size of the block to include all the lines to the
  	     * end of the existing block or the new diff, whatever ends last. */
***************
*** 1628,1641 ****
      win_T	*fromwin;
      win_T	*towin;
  {
!     buf_T	*buf = fromwin->w_buffer;
      linenr_T	lnum = fromwin->w_topline;
!     int		idx;
      diff_T	*dp;
      int		i;
  
!     idx = diff_buf_idx(buf);
!     if (idx == DB_COUNT)
  	return;		/* safety check */
  
      if (curtab->tp_diff_invalid)
--- 1630,1645 ----
      win_T	*fromwin;
      win_T	*towin;
  {
!     buf_T	*frombuf = fromwin->w_buffer;
      linenr_T	lnum = fromwin->w_topline;
!     int		fromidx;
!     int		toidx;
      diff_T	*dp;
+     int		max_count;
      int		i;
  
!     fromidx = diff_buf_idx(frombuf);
!     if (fromidx == DB_COUNT)
  	return;		/* safety check */
  
      if (curtab->tp_diff_invalid)
***************
*** 1645,1686 ****
  
      /* search for a change that includes "lnum" in the list of diffblocks. */
      for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next)
! 	if (lnum <= dp->df_lnum[idx] + dp->df_count[idx])
  	    break;
      if (dp == NULL)
      {
  	/* After last change, compute topline relative to end of file; no
  	 * filler lines. */
  	towin->w_topline = towin->w_buffer->b_ml.ml_line_count
! 					   - (buf->b_ml.ml_line_count - lnum);
      }
      else
      {
  	/* Find index for "towin". */
! 	i = diff_buf_idx(towin->w_buffer);
! 	if (i == DB_COUNT)
  	    return;		/* safety check */
  
! 	towin->w_topline = lnum + (dp->df_lnum[i] - dp->df_lnum[idx]);
! 	if (lnum >= dp->df_lnum[idx])
  	{
! 	    /* Inside a change: compute filler lines. */
! 	    if (dp->df_count[i] == dp->df_count[idx])
  		towin->w_topfill = fromwin->w_topfill;
! 	    else if (dp->df_count[i] > dp->df_count[idx])
  	    {
! 		if (lnum == dp->df_lnum[idx] + dp->df_count[idx])
! 		    towin->w_topline = dp->df_lnum[i] + dp->df_count[i]
! 							 - fromwin->w_topfill;
  	    }
! 	    else
  	    {
! 		if (towin->w_topline >= dp->df_lnum[i] + dp->df_count[i])
  		{
! 		    if (diff_flags & DIFF_FILLER)
! 			towin->w_topfill = dp->df_lnum[idx]
! 						   + dp->df_count[idx] - lnum;
! 		    towin->w_topline = dp->df_lnum[i] + dp->df_count[i];
  		}
  	    }
  	}
--- 1649,1720 ----
  
      /* search for a change that includes "lnum" in the list of diffblocks. */
      for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next)
! 	if (lnum <= dp->df_lnum[fromidx] + dp->df_count[fromidx])
  	    break;
      if (dp == NULL)
      {
  	/* After last change, compute topline relative to end of file; no
  	 * filler lines. */
  	towin->w_topline = towin->w_buffer->b_ml.ml_line_count
! 				       - (frombuf->b_ml.ml_line_count - lnum);
      }
      else
      {
  	/* Find index for "towin". */
! 	toidx = diff_buf_idx(towin->w_buffer);
! 	if (toidx == DB_COUNT)
  	    return;		/* safety check */
  
! 	towin->w_topline = lnum + (dp->df_lnum[toidx] - dp->df_lnum[fromidx]);
! 	if (lnum >= dp->df_lnum[fromidx])
  	{
! 	    /* Inside a change: compute filler lines. With three or more
! 	     * buffers we need to know the largest count. */
! 	    max_count = 0;
! 	    for (i = 0; i < DB_COUNT; ++i)
! 		if (curtab->tp_diffbuf[i] != NULL
! 					       && max_count < dp->df_count[i])
! 		    max_count = dp->df_count[i];
! 
! 	    if (dp->df_count[toidx] == dp->df_count[fromidx])
! 	    {
! 		/* same number of lines: use same filler count */
  		towin->w_topfill = fromwin->w_topfill;
! 	    }
! 	    else if (dp->df_count[toidx] > dp->df_count[fromidx])
  	    {
! 		if (lnum == dp->df_lnum[fromidx] + dp->df_count[fromidx])
! 		{
! 		    /* more lines in towin and fromwin doesn't show diff
! 		     * lines, only filler lines */
! 		    if (max_count - fromwin->w_topfill >= dp->df_count[toidx])
! 		    {
! 			/* towin also only shows filler lines */
! 			towin->w_topline = dp->df_lnum[toidx]
! 						       + dp->df_count[toidx];
! 			towin->w_topfill = fromwin->w_topfill;
! 		    }
! 		    else
! 			/* towin still has some diff lines to show */
! 			towin->w_topline = dp->df_lnum[toidx]
! 					     + max_count - fromwin->w_topfill;
! 		}
  	    }
! 	    else if (towin->w_topline >= dp->df_lnum[toidx]
! 							+ dp->df_count[toidx])
  	    {
! 		/* less lines in towin and no diff lines to show: compute
! 		 * filler lines */
! 		towin->w_topline = dp->df_lnum[toidx] + dp->df_count[toidx];
! 		if (diff_flags & DIFF_FILLER)
  		{
! 		    if (lnum == dp->df_lnum[fromidx] + dp->df_count[fromidx])
! 			/* fromwin is also out of diff lines */
! 			towin->w_topfill = fromwin->w_topfill;
! 		    else
! 			/* fromwin has some diff lines */
! 			towin->w_topfill = dp->df_lnum[fromidx]
! 							   + max_count - lnum;
  		}
  	    }
  	}
*** ../vim-7.1.233/src/version.c	Fri Jan 18 13:15:32 2008
--- src/version.c	Fri Jan 18 17:37:32 2008
***************
*** 668,669 ****
--- 668,671 ----
  {   /* Add new patch number below this line */
+ /**/
+     234,
  /**/
 
-- 
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                  BROTHER MAYNARD
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 /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
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