When you have a very long line it looks like this by dafault in Brackets editor:

1 line with no indentation                                       |
2     long line with indentation long line with indentation long | <- soft wrap
  line with indentation                                          |
3 another line                                                   |

Notice how line #2 is not indented after softwrap. This extension makes it look like this:

1 line with no indentation                                       |
2     long line with indentation long line with indentation long |
      line with indentation                                      |
3 another line                                                   |