How to update a Django field which uses pre_save, within a pre_save hook?

I am using Django Markitup to store markdown rendered versions of TextFields in a database. I'd like to normalise all unicode data upon save using unicodedata.normalize.

I've written a pre_save signal hook, which does this on all TextFields and CharField and it works well.

@receiver(pre_save)  def unicode_normalise(sender, **kwargs):      obj = kwargs['instance']      fields = obj._meta.fields      for f in fields:          # excluding django markitup rendered fields          if f.name.endswith('_rendered'):              continue            if isinstance(f, MarkupField):              _markupfield = getattr(obj, f.name)              _markupfield.raw = normalize('NFC', getattr(obj, _markupfield.raw))              # would need to re-render and save rendered version here            elif isinstance(f, (models.CharField, models.TextField)):              normalized = normalize('NFC', getattr(obj, f.name))              setattr(obj, f.name, normalized)

But Django Markitup make things complicated, as it has this two field (raw, rendered) concept, which uses pre_save to render and save into it's hidden rendered field: GitHub source

My problem is that a field's pre_save has priority over the signal pre_save, so I cannot update the fields within the signal's pre_save function (comment inserted in code block above).

How can I re-run a field's pre_save function within my pre_save hook and make sure that the rendered markupfield is updated with the new version?

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