libfuturize.fixes.fix_absolute_import duplicates initial comments

[xmo-odoo]

precondition

• Create thing/{__init__.py,foo.py,bar.py}
• Fill foo.py with the following:

  #!/usr/bin/env python
  # -*- encoding: utf-8 -*-
  import bar

• run fix_absolute_import on thing

expected

foo.py should have become:

#!/usr/bin/env python
# -*- encoding: utf-8 -*-
from __future__ import absolute_import
from . import bar

observed

foo.py has actually become:

#!/usr/bin/env python
# -*- encoding: utf-8 -*-
from __future__ import absolute_import
#!/usr/bin/env python
# -*- encoding: utf-8 -*-
from . import bar

[jmadler]

This may be related to #342