fix float height

        fm = QFontMetrics(self.font())

        h = fm.height() * self.document().size().height() * 1.05

        h += self.document().documentMargin() * 2

        h = int(h)

        if self.geometry().height() != h:

            self.setFixedHeight(max(h, self.original_height))

            self.height_changed.emit()