files: don't recurse into subrepos without a path or -S (issue5127) The 'm.always()' check was needed for when a path to 'sub1' is given, and 'sub1' contains a subrepo itself. But that also caused the automatic recursion when no path was given. Instead, force -S when printing a subrepo if the subpath is an exact match (which will unconditionally recurse once in the nested subrepo).

--- a/tests/test-subrepo-deep-nested-change.t	Tue Jan 26 22:44:29 2016 +0900
+++ b/tests/test-subrepo-deep-nested-change.t	Sun Mar 06 14:30:34 2016 -0500
@@ -297,6 +297,12 @@
   sub1/sub2/folder/bar (glob)
   sub1/sub2/x.txt (glob)
 
+  $ hg files
+  .hgsub
+  .hgsubstate
+  foo/bar/abc (glob)
+  main
+
   $ hg files -S -r '.^' sub1/sub2/folder
   sub1/sub2/folder/test.txt (glob)