sync --content now supports --hide-missing adjusted branches

This relies on git ls-files --with-tree, which I'm using in a way that
its man page does not document. Hm. I emailed the git list to try to get
the docs improved, but at least the git test suite does test the same
kind of use case I'm using here.

Performance impact when not in an adjusted branch is limited to some
additional MVar accesses, and a single git call to determine the name of
the current branch. So very minimal.

When in an adjusted branch, the performance impact is
in Annex.WorkTree.lookupFile, which starts doing an equal amount of work
for files that didn't exist as it already did for files that were
unlocked.

This commit was sponsored by Jochen Bartl on Patreon.

Git/LsFiles.hs

@@ -7,6 +7,7 @@
 
 module Git.LsFiles (
 	inRepo,
+	inRepoOrBranch,
 	notInRepo,
 	notInRepoIncludingEmptyDirectories,
 	allFiles,
@@ -34,14 +35,22 @@ import Git.Sha
 import Numeric
 import System.Posix.Types
 
-{- Scans for files that are checked into git at the specified locations. -}
+{- Scans for files that are checked into git's index at the specified locations. -}
 inRepo :: [FilePath] -> Repo -> IO ([FilePath], IO Bool)
-inRepo l = pipeNullSplit $ 
+inRepo = inRepo' [] 
+
+inRepo' :: [CommandParam] -> [FilePath] -> Repo -> IO ([FilePath], IO Bool)
+inRepo' ps l = pipeNullSplit $ 
 	Param "ls-files" :
 	Param "--cached" :
 	Param "-z" :
-	Param "--" :
-	map File l
+	ps ++
+	(Param "--" : map File l)
+
+{- Files that are checked into the index or have been committed to a
+ - branch. -}
+inRepoOrBranch :: Branch -> [FilePath] -> Repo -> IO ([FilePath], IO Bool)
+inRepoOrBranch (Ref b) = inRepo' [Param $ "--with-tree=" ++ b]
 
 {- Scans for files at the specified locations that are not checked into git. -}
 notInRepo :: Bool -> [FilePath] -> Repo -> IO ([FilePath], IO Bool)