heading-style "consistent" does not select setext_with_atx

[arwedus]

Hi @jackdewinter , I tried pymarkdownlint on a project where people use either setext_with_atx or atx style.

Config:

{
        "md003": {
            "style" : "consistent"
        }
}

Problem:

On this document, I get a warning md003 " Heading style should be consistent throughout the document. [Expected: setext; Actual: atx] (heading-style,header-style)":

Title
=====

Section 1
---------

### Subsection

Some text...

markdownlint has the same issue, but my point here is:

I would be very glad if rule md003 would detect the setext_with_atx style, because there is simply no other way to have headings of level 3 and below than with ATX (unlike in restructuredText).

Implementation is probably simple: If you encounter setext, just ignore headings L3+ (it can only be ATX, after all), or switch to setext_with_atx the first time the parser encounters a L3 ATX heading.

[jackdewinter]

@arwedus Sorry it took me so long to get to this.

{"plugins": {"md003": {"allow-setext-update": True}}}

I just added a new setting for rule Md003, allow-setext-update which does what you have asked for.

[arwedus]

@jackdewinter: Sorry, been a while. Just wanted to say thanks a lot for implementing what I requested! I'll give it a try right now.