[PATCH v2 1/2] rerere: mention caveat about unmatched conflict markers

[Thomas Gummerer <t.gummerer@gmail.com>]

4af3220 ("rerere: teach rerere to handle nested conflicts",
2018-08-05) introduced slightly better behaviour if the user commits
conflict markers and then gets another conflict in 'git rerere'.

However this is just a heuristic to punt on such conflicts better, and
doesn't deal with any unmatched conflict markers.  Make that clearer
in the documentation.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
---

> That's fine.  I'd rather keep it but perhaps add a reminder to tell
> readers that it works only when the merging of contents that already
> records with nested conflict markers happen to "cleanly nest".

Yeah that makes sense.  Maybe something like this?

(replying to <xmqq4lffk3ez.fsf@gitster-ct.c.googlers.com> here to keep
the patches in one thread)

 Documentation/technical/rerere.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/technical/rerere.txt b/Documentation/technical/rerere.txt
index e65ba9b0c6..8fefe51b00 100644
--- a/Documentation/technical/rerere.txt
+++ b/Documentation/technical/rerere.txt
@@ -149,7 +149,10 @@ version, and the sorting the conflict hunks, both for the outer and the
 inner conflict.  This is done recursively, so any number of nested
 conflicts can be handled.
 
+Note that this only works for conflict markers that "cleanly nest".  If
+there are any unmatched conflict markers, rerere will fail to handle
+the conflict and record a conflict resolution.
+
 The only difference is in how the conflict ID is calculated.  For the
 inner conflict, the conflict markers themselves are not stripped out
 before calculating the sha1.
-- 
2.18.0.1088.ge017bf2cd1