fileset: treat encoding and eol as the predicate calling _existing

Before this patch, predicate function 'encoding' and 'eol' aren't
listed up in '_existingcallers', even though they invoke 'existing()'.

This causes unexpected failure of these predicate, if there is a
(manually) deleted file in the working directory.

8a0513bf030a and 3ce3f2b059a1 seem to overlook putting already
existing 'encoding' or newly introduced 'eol' into '_existingcallers'.

This patch also changes order of fileset "eol(unix)" output in test,
because "existing caller" predicates show "A(dded)" files before
"C(lean)" ones.

mercurial/fileset.py

@@ -510,6 +510,8 def _intree(funcs, tree):
 # filesets using matchctx.existing()
 _existingcallers = [
     'binary',
+    'encoding',
+    'eol',
     'exec',
     'grep',
     'size',

tests/test-fileset.t

@@ -297,16 +297,34 Test with a revision
   >>> open('mac', 'wb').write("mac\r")
   $ hg add dos mixed mac
 
+(remove a1, to examine safety of 'eol' on removed files)
+  $ rm a1
+
   $ fileset 'eol(dos)'
   dos
   mixed
   $ fileset 'eol(unix)'
+  mixed
   .hgsub
   .hgsubstate
-  a1
   b1
   b2
   c1
-  mixed
   $ fileset 'eol(mac)'
   mac
+
+Test safety of 'encoding' on removed files
+
+  $ fileset 'encoding("ascii")'
+  dos
+  mac
+  mixed
+  .hgsub
+  .hgsubstate
+  1k
+  2k
+  b1
+  b2
+  b2link
+  bin
+  c1