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patch 9.1.0743: diff mode does not handle overlapping diffs correctly

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Problem:  diff mode does not handle overlapping diffs correctly
Solution: correct the logic to handle overlapping blocks
          (Yukihiro Nakadaira)

Vim merges overlapped diff blocks and it doesn't work expectedly
in some situation.

closes: #15735

Signed-off-by: Yukihiro Nakadaira <yukihiro.nakadaira@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Yukihiro Nakadaira
2024-09-26 16:19:42 +02:00
committed by Christian Brabandt
parent c854efc6fe
commit 06fe70c183
43 changed files with 1016 additions and 7 deletions
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13
src/diff.c
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@@ -1803,7 +1803,10 @@ diff_read(
{
for (i = idx_orig; i < idx_new; ++i)
if (curtab->tp_diffbuf[i] != NULL)
{
dp->df_lnum[i] -= off;
dp->df_count[i] += off;
}
dp->df_lnum[idx_new] = hunk->lnum_new;
dp->df_count[idx_new] = hunk->count_new;
}
@@ -1815,9 +1818,7 @@ diff_read(
}
else
// second overlap of new block with existing block
dp->df_count[idx_new] += hunk->count_new - hunk->count_orig
+ dpl->df_lnum[idx_orig] + dpl->df_count[idx_orig]
- (dp->df_lnum[idx_orig] + dp->df_count[idx_orig]);
dp->df_count[idx_new] += hunk->count_new;
// 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.
@@ -1825,10 +1826,8 @@ diff_read(
- (dpl->df_lnum[idx_orig] + dpl->df_count[idx_orig]);
if (off < 0)
{
// new change ends in existing block, adjust the end if not
// done already
if (notset)
dp->df_count[idx_new] += -off;
// new change ends in existing block, adjust the end
dp->df_count[idx_new] += -off;
off = 0;
}
for (i = idx_orig; i < idx_new; ++i)