add -p: fix checkout -p with pathological context

When I fixed the hunk offsets in add -p when hunks are skipped I forgot that the reverse patch case needs to be handled differently.

Phillip Wood (1):
add -p: fix checkout -p with pathological context

 git-add--interactive.perl  | 6 +++++-
 t/t3701-add-interactive.sh | 8 ++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

base-commit: aeb582a98374c094361cba1bd756dc6307432c42
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-262%2Fphillipwood%2Fwip%2Ffix-checkout-p-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-262/phillipwood/wip/fix-checkout-p-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/262

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From: Phillip Wood <[email protected]>

Commit fecc6f3a68 ("add -p: adjust offsets of subsequent hunks when one is skipped", 2018-03-01) fixed adding hunks in the correct place when a previous hunk has been skipped. However it did not address patches that are applied in reverse. In that case we need to adjust the pre-image offset so that when apply reverses the patch the post-image offset is adjusted correctly. We subtract rather than add the delta as the patch is reversed (the easiest way to think about it is to consider a hunk of deletions that is skipped - in that case we want to reduce offset so we need to subtract).

---
 git-add--interactive.perl  | 6 +++++-
 t/t3701-add-interactive.sh | 8 ++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

index 20eb81cc92..da5b4ec4bc 100755
@@ -972,7 +972,11 @@ sub coalesce_overlapping_hunks {
 			next;
 		}
 		if ($ofs_delta) {
-			$n_ofs += $ofs_delta;
+			if ($patch_mode_flavour{IS_REVERSE}) {
+				$o_ofs -= $ofs_delta;
+			} else {
+				$n_ofs += $ofs_delta;
+			}
 			$_->{TEXT}->[0] = format_hunk_header($o_ofs, $o_cnt,
 							     $n_ofs, $n_cnt);
 		}

index 65dfbc033a..69991a3168 100755
@@ -639,4 +639,12 @@ test_expect_success 'add -p patch editing works with pathological context lines'
 	test_cmp expected-2 actual
 '
 
+test_expect_success 'checkout -p works with pathological context lines' '
+	test_write_lines a a a a a a >a &&
+	git add a &&
+	test_write_lines a b a b a b a b a b a > a&&
+	test_write_lines s n n y q | git checkout -p &&
+	test_write_lines a b a b a a b a b a >expect &&
+	test_cmp expect a
+'
 test_done

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