code: def render_layout(self, form, context, template_pack=TEMPLATE_PACK):
          
          form.rendered_fields = set()
          form.crispy_field_template = self.field_template
  
          # This renders the specified Layout strictly
          html = self.layout.render(
              form,
              self.form_style,
              context,
              template_pack=template_pack
          )
  
          # Rendering some extra fields if specified
          if self.render_unmentioned_fields or self.render_hidden_fields or self.render_required_fields:
              fields = set(form.fields.keys())
              left_fields_to_render = fields - form.rendered_fields
              for field in left_fields_to_render:
                  if (
                      self.render_unmentioned_fields or
                      self.render_hidden_fields and form.fields[field].widget.is_hidden or
                      self.render_required_fields and form.fields[field].widget.is_required
                  ):
                      html += render_field(
                          field,
                          form,
                          self.form_style,
                          context,
                          template_pack=template_pack
                      )
  
          # If the user has Meta.fields defined, not included in the layout,
          # we suppose they need to be rendered
          if hasattr(form, 'Meta'):
              if hasattr(form.Meta, 'fields'):
                  current_fields = tuple(getattr(form, 'fields', {}).keys())
                  meta_fields = getattr(form.Meta, 'fields')
  
                  fields_to_render = list_intersection(current_fields, meta_fields)
                  left_fields_to_render = list_difference(fields_to_render, form.rendered_fields)
  
                  for field in left_fields_to_render:
                      # We still respect the configuration of the helper
                      # regarding which fields to render
                      if (
                          self.render_unmentioned_fields or
                          (self.render_hidden_fields and
                           form.fields[field].widget.is_hidden) or
                          (self.render_required_fields and
                           form.fields[field].widget.is_required)
                      ):
                          html += render_field(field, form, self.form_style, context)
  
          return mark_safe(html)
docs: Returns safe html of the rendering of the layout