# -*- coding: utf-8 -*-
from PyQt4.QtCore import QSize
from PyQt4.QtGui import *

class TabBar(QTabBar):
  def __init__(self, parent=None):
    QTabBar.__init__(self, parent)
    self.parent = parent
    self.cw = self.width()
    self.ch = self.height()

  def sizeHint(self):
    w = self.parent.width()
    return QSize(w, self.ch)

  def tabSizeHinta(self, index):
    w = self.width() / self.count()
    return QSize(w, self.ch)

app = QApplication([])

tabwidget = QTabWidget()
tabwidget.setMovable(True)
tabBar = TabBar(tabwidget)
tabwidget.setTabBar(tabBar) #Uncomment this line to see the "cut" bug.
tabwidget.insertTab(0, QTextEdit(), "test")
tabwidget.insertTab(1, QTextEdit(), "test1")
tabwidget.setMovable(True)
tabwidget.setStyleSheet("QTabWidget {qproperty-tabPosition: South;} QTabWidget::tab-bar {subcontrol-position: center;} ") #If setTabBar is commented, this will center tabs

tabwidget.show()
app.exec_()