Problem with a clean in inline formset

Hello!

The (if display.max_windows() >= display.windows) works fine to
prevent insert. Behaves as expected.
But is raised even when the row is REMOVED from the edit formset. =/

## Models

class Display(models.Model):
windows = models.IntegerField()

def max_windows(self):
total = self.window_set.all().count() #window is a
intermediary class to campaign
if total:
return total

## Clean method in CampaignInlineFormSet

def clean(self):
if any(self.errors):
# Don't bother validating the formset unless each form is
valid on its own
return
for i in range(0, self.total_form_count()):
form = self.forms[i]
cleaned_data = form.clean()
display = cleaned_data.get('display', None)
if display.max_windows() >= display.windows:
raise forms.ValidationError("The display have all
windows occupied.")

This "if" can not stop me remove a row in inline formset. How can I
fix this?
Regards.

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