isort uncomments code when odd indentation is next to an import

[pfranz]

I came across a bug where isort strips off the leading characters (in my case a comment) when there's indentation next to an import. I found this in an older version of isort, but still see it in 5.12.0

#!/usr/bin/env python3

if True:
# this comment breaks
    import sys

when invoked with isort break_isort.py results in

#!/usr/bin/env python3

if True:
is comment breaks
    import sys

[anirudnits]

The value for the indentation level of the comment gets set here: https://github.com/PyCQA/isort/blob/main/isort/core.py#L340, basically whats this is doing is setting the indentation level of the whole block without imports to the new indentation of the import block.

[anirudnits]

I'm thinking of the various use-cases that arise there, one simple fix here is to the convert the last conditional in line#338 to

...
and ( not did_contain_imports and len(new_indent) < len(indent) )

that would solve this issue but this my interfere with certain cimports.