git-p4: allow unshelving of branched files

When unshelving a changelist, git-p4 tries to work out the appropriate
parent commit in a given branch (default: HEAD).  To do this, it looks
at the state of any pre-existing files in the target Perforce branch,
omitting files added in the shelved changelist.  Currently, only files
added (or move targets) are classed as new.  However, files integrated
from other branches (i.e. a 'branch' action) also need to be considered
as added, for this purpose.

Signed-off-by: Simon Williams <simon@no-dns-yet.org.uk>
Acked-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-p4.py

@@ -1309,7 +1309,7 @@ class GitLFS(LargeFileSystem):
 
 class Command:
     delete_actions = ( "delete", "move/delete", "purge" )
-    add_actions = ( "add", "move/add" )
+    add_actions = ( "add", "branch", "move/add" )
 
     def __init__(self):
         self.usage = "usage: %prog [options]"

t/t9832-unshelve.sh

@@ -22,7 +22,10 @@ test_expect_success 'init depot' '
 		: >file_to_move &&
 		p4 add file_to_delete &&
 		p4 add file_to_move &&
-		p4 submit -d "add files to delete"
+		p4 submit -d "add files to delete" &&
+		echo file_to_integrate >file_to_integrate &&
+		p4 add file_to_integrate &&
+		p4 submit -d "add file to integrate"
 	)
 '
 
@@ -40,6 +43,7 @@ test_expect_success 'create shelved changelist' '
 		p4 delete file_to_delete &&
 		p4 edit file_to_move &&
 		p4 move file_to_move moved_file &&
+		p4 integrate file_to_integrate integrated_file &&
 		p4 opened &&
 		p4 shelve -i <<EOF
 Change: new
@@ -53,6 +57,7 @@ Files:
 	//depot/file_to_delete
 	//depot/file_to_move
 	//depot/moved_file
+	//depot/integrated_file
 EOF
 
 	) &&
@@ -65,6 +70,7 @@ EOF
 		test_path_is_file file2 &&
 		test_cmp file1 "$cli"/file1 &&
 		test_cmp file2 "$cli"/file2 &&
+		test_cmp file_to_integrate "$cli"/integrated_file &&
 		test_path_is_missing file_to_delete &&
 		test_path_is_missing file_to_move &&
 		test_path_is_file moved_file