Fixed recent regression of recent minor charsUntil optimisation

--HG--
extra : convert_revision : svn%3Aacbfec75-9323-0410-a652-858a13e371e0/trunk%401245

src/html5lib/inputstream.py

@@ -343,15 +343,20 @@ def charsUntil(self, characters, opposite = False):
  # Find the longest matching prefix
  m = chars.match(self.chunk, self.chunkOffset)
  if m is None:
- end = self.chunkOffset
+ # If nothing matched, and it wasn't because we ran out of chunk,
+ # then stop
+ if self.chunkOffset != self.chunkSize:
+ break
  else:
  end = m.end()
- # If not everything matched, return everything up to the part that didn't match
- if end != self.chunkSize:
- rv.append(self.chunk[self.chunkOffset:end])
- self.chunkOffset = end
- break
- # If the whole chunk matched, use it all and read the next chunk
+ # If not the whole chunk matched, return everything
+ # up to the part that didn't match
+ if end != self.chunkSize:
+ rv.append(self.chunk[self.chunkOffset:end])
+ self.chunkOffset = end
+ break
+ # If the whole remainder of the chunk matched,
+ # use it all and read the next chunk
  rv.append(self.chunk[self.chunkOffset:])
  if not self.readChunk():
  # Reached EOF