[PATCHv2 2/2] git-p4: fix `unshelve` bug finding parent commit

[Luke Diamand <luke@diamand.org>]

`unshelve` was using HEAD^$n to find the parent commit. This meant that
any intervening commits between HEAD and the last git-p4 commit would
cause the unshelve to fail.

e.g.
    123ab Local git-only commit
    234bc Another local git-only commit
    345cd Perforce tip revision

Unshelve needs to find 345cd.

Use HEAD~$n instead.

Reported-by: Liu Xuhui (Jackson) <Xuhui.Liu@amd.com>
Signed-off-by: Luke Diamand <luke@diamand.org>
---
 git-p4.py           | 2 +-
 t/t9832-unshelve.sh | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/git-p4.py b/git-p4.py
index ca79dc0900..4433ca53de 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -4237,7 +4237,7 @@ def findLastP4Revision(self, starting_point):
         """
 
         for parent in (range(65535)):
-            log = extractLogMessageFromGitCommit("{0}^{1}".format(starting_point, parent))
+            log = extractLogMessageFromGitCommit("{0}~{1}".format(starting_point, parent))
             settings = extractSettingsGitLog(log)
             if 'change' in settings:
                 return settings
diff --git a/t/t9832-unshelve.sh b/t/t9832-unshelve.sh
index feda4499dd..7194fb2855 100755
--- a/t/t9832-unshelve.sh
+++ b/t/t9832-unshelve.sh
@@ -80,7 +80,7 @@ EOF
 	)
 '
 
-test_expect_failure 'update shelved changelist and re-unshelve' '
+test_expect_success 'update shelved changelist and re-unshelve' '
 	test_when_finished cleanup_git &&
 	(
 		cd "$cli" &&
-- 
2.20.1.390.gb5101f9297