better styling management

def extract_run(run: Run, ctx: RunContext):

    # invariant: last character of last item in ctx.content is a non-blank character

    # invariant: last character of last item in ctx.content is a non-word character

    # manage opening/closing tags

    manage_ctx(ctx, run, Markup.STRONG)

    text = run.text.replace(" ", " ")

    # extract white space before and after

    before, text, after = re.match(r"^(\s*)(.*?)(\s*)$", text, re.DOTALL).groups()

    before, text, after = re.match(r"^(\W*)(.*?)(\W*)$", text, re.DOTALL).groups()

    if before:

        ctx.buffer_blank.append(before)

    ):

        ctx = RunContext(extract_format)

        # keep track of spaces, as md markup needs to be right before/after non-space characters

        # invariant: last character of last item in ctx.content is a non-blank character

        # invariant: last character of last item in ctx.content is a non-word character

        # We cannot use python-docx method iter_inner_content, as it only considers runs and hyperlinks.

        # For example elements <fldSimple> are ignored