convert: avoid dirstate checks; add a test

During a conversion, the dirstate contents are not consistent - there
are files that may be missing from the dirstate and there may be files
that shouldn't be in the dirstate.

While this is not fixed, don't mark files as added - put them directly
in state 'n'ormal.

tests/test-convert-hg-sink

@@ -0,0 +1,27 b''
+#!/bin/sh
+
+echo "[extensions]" >> $HGRCPATH
+echo "hgext.convert=" >> $HGRCPATH
+
+hg init orig
+cd orig
+echo foo > foo
+echo bar > bar
+hg ci -qAm 'add foo and bar' -d '0 0'
+
+hg rm foo
+hg ci -m 'remove foo' -d '0 0'
+
+mkdir foo
+echo file > foo/file
+hg ci -qAm 'add foo/file' -d '0 0'
+
+hg tag -d '0 0' some-tag
+
+hg log
+cd ..
+
+hg convert orig new 2>&1 | grep -v 'subversion python bindings could not be loaded'
+cd new
+hg out ../orig
+true

tests/test-convert-hg-sink.out

@@ -0,0 +1,33 b''
+changeset:   3:593cbf6fb2b4
+tag:         tip
+user:        test
+date:        Thu Jan 01 00:00:00 1970 +0000
+summary:     Added tag some-tag for changeset ad681a868e44
+
+changeset:   2:ad681a868e44
+tag:         some-tag
+user:        test
+date:        Thu Jan 01 00:00:00 1970 +0000
+summary:     add foo/file
+
+changeset:   1:cbba8ecc03b7
+user:        test
+date:        Thu Jan 01 00:00:00 1970 +0000
+summary:     remove foo
+
+changeset:   0:327daa9251fa
+user:        test
+date:        Thu Jan 01 00:00:00 1970 +0000
+summary:     add foo and bar
+
+initializing destination new repository
+scanning source...
+sorting...
+converting...
+3 add foo and bar
+2 remove foo
+1 add foo/file
+0 Added tag some-tag for changeset ad681a868e44
+comparing with ../orig
+searching for changes
+no changes found

hgext/convert/hg.py

@@ -50,7 +50,7 b' class mercurial_sink(converter_sink):'
     def putfile(self, f, e, data):
         self.repo.wwrite(f, data, e)
         if f not in self.repo.dirstate:
-            self.repo.dirstate.add(f)
+            self.repo.dirstate.normallookup(f)
 
     def copyfile(self, source, dest):
         self.repo.copy(source, dest)
@@ -111,7 +111,7 b' class mercurial_sink(converter_sink):'
             p2 = parents.pop(0)
             a = self.repo.rawcommit(files, text, commit.author, commit.date,
                                     bin(p1), bin(p2), extra=extra)
-            self.repo.dirstate.invalidate()
+            self.repo.dirstate.clear()
             text = "(octopus merge fixup)\n"
             p2 = hg.hex(self.repo.changelog.tip())