fix LsFiles.typeChanged paths

Passing absolute paths to Command.Add used to work, but after recent
changes doesn't. All LsFiles should use relative paths anyway, so fix it
there.

Git/LsFiles.hs

@@ -65,7 +65,13 @@ typeChanged :: [FilePath] -> Repo -> IO [FilePath]
 typeChanged = typeChanged' []
 
 typeChanged' :: [CommandParam] -> [FilePath] -> Repo -> IO [FilePath]
-typeChanged' ps l = pipeNullSplit $ prefix ++ ps ++ suffix
+typeChanged' ps l repo = do
+	fs <- pipeNullSplit (prefix ++ ps ++ suffix) repo
+	-- git diff returns filenames relative to the top of the git repo;
+	-- convert to filenames relative to the cwd, like git ls-files.
+	let top = workTree repo
+	cwd <- getCurrentDirectory
+	return $ map (\f -> relPathDirToFile cwd $ top </> f) fs
 	where
 		prefix = [Params "diff --name-only --diff-filter=T -z"]
 		suffix = Param "--" : map File l