convert/bzr: make it work with filemaps (issue1631)

The bzr converter maintains a child -> parents mapping and drop entries
whenever a child is read. It does not work with filemaps, getchangedfiles() may
be called more than once when filtered files belong to merge revisions.
getchanges() still works that way but it is not clear whether a similar issue
can arise when interacting with merges.

hgext/convert/bzr.py

@@ -123,9 +123,8 b' class bzr_source(converter_source):'
     def getchangedfiles(self, rev, i):
         self._modecache = {}
         curtree = self.sourcerepo.revision_tree(rev)
-        parentids = self._parentids.pop(rev)
         if i is not None:
-            parentid = parentids[i]
+            parentid = self._parentids[rev][i]
         else:
             # no parent id, get the empty revision
             parentid = revision.NULL_REVISION

tests/test-convert-bzr

@@ -27,6 +27,12 b' hg manifest -R source-hg -r tip'
 echo "% test --rev option"
 hg convert -r 1 source source-1-hg
 glog -R source-1-hg
+echo "% test with filemap"
+cat > filemap <<EOF
+exclude a
+EOF
+hg convert --filemap filemap source source-filemap-hg
+hg -R source-filemap-hg manifest -r tip
 cd ..
 
 echo % merge

tests/test-convert-bzr.out

@@ -25,6 +25,16 b' converting...'
 0 Initial add: a, c, e
 o  0 "Initial add: a, c, e" files: a c e
 
+% test with filemap
+initializing destination source-filemap-hg repository
+scanning source...
+sorting...
+converting...
+1 Initial add: a, c, e
+0 rename a into b, create a, rename c into d
+b
+d
+f
 % merge
 initializing destination source-hg repository
 scanning source...