lfs: teach the 'lfs()' fileset to handle removed files

The callstatus setting is required to notice the removal of 'lfs.test' in rev 6
in the tests, even though this isn't directly calling mctx.status().  However,
it's not needed to get the results in the tests for `hg status`, so I'm probably
missing something.

hgext/lfs/__init__.py

@@ -350,13 +350,13 b' def extsetup(ui):'
     # when writing a bundle via "hg bundle" command, upload related LFS blobs
     wrapfunction(bundle2, 'writenewbundle', wrapper.writenewbundle)
 
-@filesetpredicate('lfs()')
+@filesetpredicate('lfs()', callstatus=True)
 def lfsfileset(mctx, x):
     """File that uses LFS storage."""
     # i18n: "lfs" is a keyword
     fileset.getargs(x, 0, 0, _("lfs takes no arguments"))
     return [f for f in mctx.subset
-            if wrapper.pointerfromctx(mctx.ctx, f) is not None]
+            if wrapper.pointerfromctx(mctx.ctx, f, removed=True) is not None]
 
 @templatekeyword('lfs_files')
 def lfsfiles(repo, ctx, **args):

tests/test-lfs.t

@@ -162,6 +162,11 b' enabled adds the lfs requirement'
 
   $ hg mv large l
   $ hg mv small s
+  $ hg status 'set:removed()'
+  R large
+  R small
+  $ hg status 'set:removed() & lfs()'
+  R large
   $ hg commit -m 'renames'
 
   $ hg files -r . 'set:copied()'
@@ -169,6 +174,11 b' enabled adds the lfs requirement'
   s
   $ hg files -r . 'set:copied() & lfs()'
   l
+  $ hg status --change . 'set:removed()'
+  R large
+  R small
+  $ hg status --change . 'set:removed() & lfs()'
+  R large
 
   $ echo SHORT > l
   $ echo BECOME-LARGER-FROM-SHORTER > s
@@ -1042,11 +1052,11 b' The LFS policy stops when the .hglfs is '
   2 lfs.catchall: sha256:d4ec46c2869ba22eceb42a729377432052d9dd75d82fc40390ebaadecee87ee9
   2 lfs.test: sha256:5489e6ced8c36a7b267292bde9fd5242a5f80a7482e8f23fa0477393dfaa4d6c
 
-TODO: This should notice the deleted lfs files in rev 6
   $ hg log -r 'file("set:lfs()")' -T '{rev} {join(lfs_files, ", ")}\n'
   2 lfs.catchall, lfs.test
   3 lfs.catchall, lfs.test
   5 lfs.test
+  6 lfs.test
 
   $ cd ..