Merge branch 'ld/p4-unshelve-fix'

The "unshelve" subcommand of "git p4" used incorrectly used
commit^N where it meant to say commit~N to name the Nth generation
ancestor, which has been corrected.

* ld/p4-unshelve-fix:
  git-p4: use HEAD~$n to find parent commit for unshelve
  git-p4 unshelve: adding a commit breaks git-p4 unshelve

Author: gitster

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

t/t9832-unshelve.sh

@@ -29,8 +29,11 @@ test_expect_success 'init depot' '
 	)
 '
 
+# Create an initial clone, with a commit unrelated to the P4 change
+# on HEAD
 test_expect_success 'initial clone' '
-	git p4 clone --dest="$git" //depot/@all
+	git p4 clone --dest="$git" //depot/@all &&
+    test_commit -C "$git" "unrelated"
 '
 
 test_expect_success 'create shelved changelist' '