add_imports option is broken

[fyber]

Just installed new version of isort=4.3.0 (on python 3.6).
Given this file (itest.py):

from __future__ import absolute_import, unicode_literals

VAR = """
multiline text
"""

and this config in setup.cfg:

[isort]
add_imports =
    from __future__ import absolute_import
    from __future__ import unicode_literals

when I run isort itest.py I got this result:

from __future__ import absolute_import, unicode_literals

VAR = """
multiline text
"""

from __future__ import unicode_literals
from __future__ import absolute_import

When I run same command one more time the result is like this:

from __future__ import absolute_import, unicode_literals

VAR = """
multiline text
"""

from __future__ import unicode_literals
from __future__ import absolute_import

from __future__ import absolute_import
from __future__ import unicode_literals

If I remove VAR from that file and run isort again, the result is as expected:

from __future__ import absolute_import, unicode_literals

I believe this is a regression as I was unable to reproduce it in version 4.2.15.
This bug makes new version unusable for us, since we have files with multiline strings and add_imports setting.

[adamchainz]

Also seeing this when upgrading in adamchainz/django-mysql#424

[timothycrosley]

This should now be fixed in release 4.3.1, Thank you!

[fyber]

I'm sorry, but looks like this is not fixed in version 4.3.1.
Output is the same as in my example above.

[adamchainz]

I'm afraid I'm also still seeing the same, updated my previously linked PR

[timothycrosley]

I'm so sorry! I didn't merge the fix in correctly before distributing the new release to PYPI, this should now be resolved in 4.3.2

[adamchainz]

Works for me thanks!

[adamchainz]