--- a/tests/test-copies-chain-merge.t Fri Jun 19 06:04:48 2020 +0200
+++ b/tests/test-copies-chain-merge.t Fri Jun 19 06:15:06 2020 +0200
@@ -926,3 +926,71 @@
A d
$ hg status --copies --rev 'desc("g-1")' --rev 'desc("mCGm-0")'
$ hg status --copies --rev 'desc("g-1")' --rev 'desc("mGCm-0")'
+
+
+Comparing with merge restoring an untouched deleted file
+--------------------------------------------------------
+
+Merge:
+- one removing a file (d)
+- one leaving the file untouched
+- the merge actively restore the file to the same content.
+
+In this case, the file keep on living after the merge. So we should not drop its
+copy tracing chain.
+
+ $ hg up 'desc("c-1")'
+ 0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+ $ hg merge 'desc("b-1")'
+ 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+ (branch merge, don't forget to commit)
+ $ hg revert --rev 'desc("b-1")' d
+ $ hg ci -m "mCB-revert-m-0"
+ created new head
+
+ $ hg up 'desc("b-1")'
+ 0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+ $ hg merge 'desc("c-1")'
+ 0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+ (branch merge, don't forget to commit)
+ $ hg revert --rev 'desc("b-1")' d
+ $ hg ci -m "mBC-revert-m-0"
+ created new head
+
+ $ hg log -G --rev '::(desc("mCB-revert-m")+desc("mBC-revert-m"))'
+ @ 33 mBC-revert-m-0
+ |\
+ +---o 32 mCB-revert-m-0
+ | |/
+ | o 6 c-1 delete d
+ | |
+ o | 5 b-1: b update
+ |/
+ o 2 i-2: c -move-> d
+ |
+ o 1 i-1: a -move-> c
+ |
+ o 0 i-0 initial commit: a b h
+
+
+BROKEN: 'a' should be the the source of 'd' in the changeset centric algorithm too
+
+ $ hg status --copies --rev 'desc("i-0")' --rev 'desc("mCB-revert-m-0")'
+ M b
+ A d
+ a (filelog !)
+ R a
+ $ hg status --copies --rev 'desc("i-0")' --rev 'desc("mBC-revert-m-0")'
+ M b
+ A d
+ a (filelog !)
+ R a
+ $ hg status --copies --rev 'desc("c-1")' --rev 'desc("mCB-revert-m-0")'
+ M b
+ A d
+ $ hg status --copies --rev 'desc("c-1")' --rev 'desc("mBC-revert-m-0")'
+ M b
+ A d
+ $ hg status --copies --rev 'desc("b-1")' --rev 'desc("mCB-revert-m-0")'
+ $ hg status --copies --rev 'desc("b-1")' --rev 'desc("mBC-revert-m-0")'
+