discovery: only calculate closed branches if required
The number of new closed branches is required for printing in error message. So
let's only calculate them if we need to print error about new branches.
Differential Revision: https://phab.mercurial-scm.org/D6314
#testcases flat tree
$ . "$TESTDIR/narrow-library.sh"
#if tree
$ cat << EOF >> $HGRCPATH
> [experimental]
> treemanifest = 1
> EOF
#endif
create full repo
$ hg init master
$ cd master
$ mkdir inside
$ echo inside > inside/f1
$ mkdir outside
$ echo outside > outside/f1
$ hg ci -Aqm 'initial'
$ echo modified > inside/f1
$ hg ci -qm 'modify inside'
$ echo modified > outside/f1
$ hg ci -qm 'modify outside'
$ cd ..
$ hg clone --narrow ssh://user@dummy/master narrow --include inside
requesting all changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 2 changes to 1 files
new changesets *:* (glob)
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd narrow
Can show patch touching paths outside
$ hg log -p
changeset: 2:* (glob)
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: modify outside
changeset: 1:* (glob)
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: modify inside
diff -r * -r * inside/f1 (glob)
--- a/inside/f1 Thu Jan 01 00:00:00 1970 +0000
+++ b/inside/f1 Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +1,1 @@
-inside
+modified
changeset: 0:* (glob)
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: initial
diff -r 000000000000 -r * inside/f1 (glob)
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/inside/f1 Thu Jan 01 00:00:00 1970 +0000
@@ -0,0 +1,1 @@
+inside
$ hg status --rev 1 --rev 2
Can show copies inside the narrow clone
$ hg cp inside/f1 inside/f2
$ hg diff --git
diff --git a/inside/f1 b/inside/f2
copy from inside/f1
copy to inside/f2