best.width += max(self._minimumPaneSize, winbest.width)
best.height = max(best.height, winbest.height)
best.width += sashsize * (len(self._windows)-1)
else:
for win in self._windows:
best.width += max(self._minimumPaneSize, winbest.width)
best.height = max(best.height, winbest.height)
best.width += sashsize * (len(self._windows)-1)
else:
for win in self._windows: