def mouseMoveEvent(self, event):
assert isinstance(event, QMouseEvent)
c = self.cursorForPosition(event.pos())
for sel in self.__selections:
if sel.containsCursor(c) and sel.tooltip:
QToolTip.showText(self.mapToGlobal(event.pos()), sel.tooltip, self)
break
QPlainTextEdit.mouseMoveEvent(self, event)
