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Nguyễn Thái Ngọc Duy a7256debd4 checkout.txt: note about losing staged changes with --merge 
If you have staged changes in path A and perform 'checkout
--merge' (which could result in conflicts in a totally unrelated path
B), changes in A will be gone. Which is unexpected. We are supposed
to keep all changes, or kick and scream otherwise.

This is the result of how --merge is implemented, from the very first
day in 1be0659efc (checkout: merge local modifications while switching
branches., 2006-01-12):

1. a merge is done, unmerged entries are collected
2. a hard switch to a new branch is done, then unmerged entries added
   back

There is no trivial fix for this. Going with 3-way merge one file at a
time loses rename detection. Going with 3-way merge by trees requires
teaching the algorithm to pick up staged changes. And even if we detect
staged changes with --merge and abort for safety, an option to continue
--merge is very weird. Such an option would keep worktree changes, but
drop staged changes.

Because the problem has been with us since the introduction of --merge
and everybody has been pretty happy (except Phillip, who found this
problem), I'll just take a note here to acknowledge it and wait for
merge wizards to come in and work their magic. There may be a way
forward [1].

[1] CABPp-BFoL_U=bzON4SEMaQSKU2TKwnOgNqjt5MUaOejTKGUJxw@mail.gmail.com

Reported-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-03-21 12:07:41 +09:00
..
add.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
am.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
annotate.c
apply.c apply.c: make init_apply_state() take a struct repository 2018-08-13 14:14:44 -07:00
archive.c pack-protocol.txt: accept error packets in any context 2019-01-02 13:05:30 -08:00
bisect--helper.c Fix typos in translatable strings for v2.21.0 2019-02-11 12:58:06 -08:00
blame.c Merge branch 'lt/date-human' 2019-02-06 22:05:24 -08:00
branch.c Merge branch 'tq/branch-style-fix' into maint 2018-11-21 22:58:06 +09:00
bundle.c create_bundle(): drop unused "header" parameter 2019-01-24 12:35:44 -08:00
cat-file.c Merge branch 'jk/loose-object-cache-oid' 2019-02-06 22:05:27 -08:00
check-attr.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
check-ignore.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
check-mailmap.c
check-ref-format.c Merge branch 'jc/check-ref-format-oor' 2017-11-06 14:24:28 +09:00
checkout-index.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
checkout.c checkout.txt: note about losing staged changes with --merge 2019-03-21 12:07:41 +09:00
clean.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
clone.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
column.c
commit-graph.c commit-graph: rename "large edges" to "extra edges" 2019-01-22 11:33:46 -08:00
commit-tree.c commit-tree: add missing --gpg-sign flag 2019-01-22 11:08:35 -08:00
commit.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
config.c Merge branch 'jk/save-getenv-result' 2019-01-29 12:47:54 -08:00
count-objects.c rename "alternate_object_database" to "object_directory" 2018-11-13 14:22:02 +09:00
credential.c
describe.c Merge branch 'ss/describe-dirty-in-the-right-directory' 2019-02-06 22:05:29 -08:00
diff-files.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
diff-index.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
diff-tree.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
diff.c Merge branch 'sl/const' 2019-02-06 22:05:28 -08:00
difftool.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
fast-export.c Merge branch 'en/fast-export-import' 2019-01-04 13:33:33 -08:00
fetch-pack.c Merge branch 'jt/fetch-v2-sideband' 2019-02-05 14:26:11 -08:00
fetch.c Fix typos in translatable strings for v2.21.0 2019-02-11 12:58:06 -08:00
fmt-merge-msg.c Merge branch 'nd/the-index' 2018-10-19 13:34:02 +09:00
for-each-ref.c
fsck.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
gc.c Merge branch 'js/gc-repack-close-before-remove' 2019-01-18 13:49:57 -08:00
get-tar-commit-id.c
grep.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
hash-object.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
help.c Merge branch 'rv/alias-help' 2018-10-26 14:22:13 +09:00
index-pack.c convert has_sha1_file() callers to has_object_file() 2019-01-08 09:41:06 -08:00
init-db.c Merge branch 'jk/save-getenv-result' 2019-01-29 12:47:54 -08:00
interpret-trailers.c assert NOARG/NONEG behavior of parse-options callbacks 2018-11-06 12:56:29 +09:00
log.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
ls-files.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
ls-remote.c Merge branch 'jk/proto-v2-ref-prefix-fix' 2018-11-13 22:37:17 +09:00
ls-tree.c Merge branch 'nd/attr-pathspec-in-tree-walk' 2019-01-14 15:29:28 -08:00
mailinfo.c
mailsplit.c mailinfo & mailsplit: check for EOF while parsing 2017-05-08 12:18:19 +09:00
merge-base.c Merge branch 'pk/rebase-in-c-4-opts' 2018-11-02 11:04:55 +09:00
merge-file.c assert NOARG/NONEG behavior of parse-options callbacks 2018-11-06 12:56:29 +09:00
merge-index.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
merge-ours.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
merge-recursive.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
merge-tree.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
merge.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
mktag.c
mktree.c builtin/mktree: remove hard-coded constant 2018-10-15 12:53:15 +09:00
multi-pack-index.c multi-pack-index: add 'verify' verb 2018-09-17 13:49:38 -07:00
mv.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
name-rev.c tag: add repository argument to deref_tag 2018-06-29 10:43:39 -07:00
notes.c Merge branch 'nd/the-index' into md/list-objects-filter-by-depth 2019-01-15 15:38:29 -08:00
pack-objects.c Merge branch 'sl/const' 2019-02-06 22:05:28 -08:00
pack-redundant.c various: tighten constness of some local variables 2019-02-04 09:57:10 -08:00
pack-refs.c
patch-id.c
prune-packed.c for_each_*_object: move declarations to object-store.h 2018-08-14 12:29:57 -07:00
prune.c Merge branch 'md/exclude-promisor-objects-fix-cleanup' 2019-01-14 15:29:31 -08:00
pull.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
push.c Merge branch 'nd/style-opening-brace' 2019-01-18 13:49:52 -08:00
range-diff.c Merge branch 'nd/the-index' 2018-10-19 13:34:02 +09:00
read-tree.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
rebase--interactive.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
rebase.c Fix typos in translatable strings for v2.21.0 2019-02-11 12:58:06 -08:00
receive-pack.c pack-protocol.txt: accept error packets in any context 2019-01-02 13:05:30 -08:00
reflog.c Merge branch 'jk/loose-object-cache-oid' 2019-02-06 22:05:27 -08:00
remote-ext.c
remote-fd.c
remote.c Merge branch 'ms/remote-error-message-update' 2018-09-24 10:30:52 -07:00
repack.c Merge branch 'js/gc-repack-close-before-remove' 2019-01-18 13:49:57 -08:00
replace.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
rerere.c Merge branch 'nd/the-index' into md/list-objects-filter-by-depth 2019-01-15 15:38:29 -08:00
reset.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
rev-list.c Merge branch 'ds/push-sparse-tree-walk' 2019-02-06 22:05:25 -08:00
rev-parse.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
revert.c Merge branch 'nd/the-index' 2019-01-04 13:33:33 -08:00
rm.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
send-pack.c pack-protocol.txt: accept error packets in any context 2019-01-02 13:05:30 -08:00
serve.c
shortlog.c Merge branch 'nd/show-gitcomp-compilation-fix' into maint 2018-12-15 12:24:33 +09:00
show-branch.c assert NOARG/NONEG behavior of parse-options callbacks 2018-11-06 12:56:29 +09:00
show-index.c make show-index a builtin 2018-05-29 00:28:22 +09:00
show-ref.c convert has_sha1_file() callers to has_object_file() 2019-01-08 09:41:06 -08:00
stripspace.c stripspace: allow -s/-c outside git repository 2018-12-26 15:41:47 -08:00
submodule--helper.c Merge branch 'nd/the-index-final' 2019-02-06 22:05:23 -08:00
symbolic-ref.c
tag.c assert NOARG/NONEG behavior of parse-options callbacks 2018-11-06 12:56:29 +09:00
unpack-file.c
unpack-objects.c convert "hashcmp() != 0" to "!hasheq()" 2018-08-29 11:32:49 -07:00
update-index.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
update-ref.c update-ref: allow --no-deref with --stdin 2018-09-12 15:17:17 -07:00
update-server-info.c
upload-archive.c archive: initialize archivers earlier 2018-10-26 10:17:59 +09:00
upload-pack.c check_replace_refs: rename to read_replace_refs 2018-07-18 15:45:14 -07:00
var.c
verify-commit.c commit: add repository argument to lookup_commit 2018-06-29 10:43:39 -07:00
verify-pack.c
verify-tag.c
worktree.c worktree: allow to (re)move worktrees with uninitialized submodules 2019-01-07 09:26:33 -08:00
write-tree.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00