revset: make `hg log -r 'wdir()^'` work (issue4905)

This patch catches the WdirUnsupported exception to support wdir()^.

mercurial/revset.py

@@ -1408,7 +1408,10 b' def p1(repo, subset, x):'
     ps = set()
     cl = repo.changelog
     for r in getset(repo, fullreposet(repo), x):
-        ps.add(cl.parentrevs(r)[0])
+        try:
+            ps.add(cl.parentrevs(r)[0])
+        except error.WdirUnsupported:
+            ps.add(repo[r].parents()[0].rev())
     ps -= {node.nullrev}
     # XXX we should turn this into a baseset instead of a set, smartset may do
     # some optimizations from the fact this is a baseset.

tests/test-revset.t

@@ -1221,6 +1221,15 b" BROKEN: should be '-1'"
 Test working-directory revision
   $ hg debugrevspec 'wdir()'
   2147483647
+  $ hg debugrevspec 'wdir()^'
+  9
+  $ hg up 7
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ hg debugrevspec 'wdir()^'
+  7
+For tests consistency
+  $ hg up 9
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg debugrevspec 'tip or wdir()'
   9
   2147483647